Polymers are observed in a range of materials that have a wide array of properties. Find the definition of Mole in the largest biology dictionary online. For synthesis: Organic chemistry helps us synthesis many compounds which are needed on a large scale. Therefore, the proposed new definition states that: ‘one mole contains exactly 6. Explanations by Jupiter Scientific of the science jokes. We use it to count large amounts of tiny things, like atoms, molecules, and ions. 5 The Meaning. mole: The mole (abbreviation, mol) is the Standard International ( SI ) unit of material quantity. ppt), PDF File (. The molar mass is the mass (in grams) for 1 mole of the particle. just a dozen a dozen means 12 right? but 12 what? does it have to be eggs? no it does not. 02 x 10 raised to the power of 23. 012 kg) sample. It offers a more. Edexcel Advanced GCE in Chemistry (9080) Edexcel Advanced GCE in Chemistry (Nuffield) (9086) - Issue 3 - October 2004 Section 1 Atoms All matter is made of particles. A dysplastic nevus is a type of mole that looks different from a common mole. It does not occur uncombined in nature but occurs chiefly as the oxide (silica) and as silicates. You will find a table of standard enthalpies of formation of many common substances in Appendix. By definition, a mole (symbolized as mol) is the quantitative amount of any given substance that contains as many atoms, molecules, or formula units as the number of atoms in exactly 12 g of carbon-12. using half and overall reactions. Unit = Moles per lit. What better way to spend Mole Day than sharing a few mole puns with our friend Chemistry Mole. 02 ´ 1023 of that thing. Let's talk about a concept that probably confuses chemistry students the most on some level. Formula weight is the sum of the atomic weights of all the atoms indicated in the chemical formula of a substance. Learn definition chemistry chapter 10 mole with free interactive flashcards. in surnames); perhaps a shortening of obsolete moldwarp, literally "earth-thrower," but this sort of abbreviation is rare at that early age, and perhaps it is rather directly from the root of mold (n. It is kind of confusing because it implies that one mole of oxygen is the same as one mole of hydrogen, which is actually true. Atomic mass is the concept related to a single atom, whereas molecular mass relates to a group of atoms. To calculate mole fraction, we need to know: The number of moles of each component present in the solution. Learn about the fundamental concepts of chemistry including structure and states of matter, intermolecular forces, and reactions. The SI base unit for amount of substance is the mole. Moles in chemistry have nothing to do with the small brown/gray yard pests that dig under your flowers and lawn or a tasty sauce on a Mexican dish. The International Union of Pure and Applied Chemistry (Iupac) recommends revising the definition of the mole. For example, the atomic mass of copper is about 63. One equivalent: In reaction stoichiometry, the amount of one substance that reacts with one mole of another substance. After an extensive consultation with the chemistry community, and following a review and critical evaluation of the literature, IUPAC is recommending a new definition of the mole based on a specified number of elementary entities: The mole, symbol mol, is the SI unit of amount of substance. 02 × 10 23, is known as Avogadro ’ s number in honor of Count Amedeo Avogadro (1776-1856), an Italian professor of chemistry and physics at the University of Turin who was the first person to distinguish in a useful way between atoms and molecules. Mole fraction definition, the ratio of the number of moles of a given component of a mixture to the total number of moles of all the components. This looks at plastics. Happy Mole Day! It's a great day to talk science! See more of The Journey Outpost on Facebook. ’ ‘The only blemish is a small mole just under his left eye, but somehow that little imperfection makes him so much better looking. Suppose it is said to find the molar mass of 32g grams of oxygen then as we know that 1mole of oxygen = 16g. 02214076×10 23 was not a fixed numerical constant, but rather it was the number of as many elementary entities as there are atoms in 0. What is a mole in this video can you learn more about a mole,definition of mole Ever wondered what 'moles' and why chemists use mole in chemistry. Hydrogen is the smallest atom and it was originally used as the standard by which all the other atoms were compared. mole (plural moles) ( chemistry , physics ) In the International System of Units , the base unit of amount of substance; the amount of substance of a system which contains as many elementary entities (atoms, ions , molecules , etc. It is used as the bridge between chemistry on the atomic and macroscopic scale. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size. List of over 1000 measurements, units, prefixes, physical constants, abbreviations, and synonyms that are recognized by the ConvertIt. like the many of the canyons and cliffs of the state of Colorado. The material covered here will be needed in virtually every topic you will encounter in the remainder of your first-year course, as well as in subsequent Chemistry courses -- so you might as well master it now! The Chem1 Virtual Textbook is a resource for General Chemistry aimed mainly at the first-year university level. A mole of chemistry teachers is 6. Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6. The atomic mass of an element can be used to see how much of the element makes a mole. Printer friendly. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size. mole: the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon 12 isotope. Mole fraction #chi# (the Greek letter chi) is the number of moles of a given component of a mixture divided by the total number of moles in the mixture. It's also an open-access journal, meaning students and professionals can read it without a subscription. Cannabidiol | C21H30O2 | CID 644019 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety. This is also referred to as Avagadro’s number. It is kind of confusing because it implies that one mole of oxygen is the same as one mole of hydrogen, which is actually true. Published from 2012-2015, The Mole was the Royal Society of Chemistry's magazine for students, and anyone inspired to dig deeper into chemistry. In these cases, the mole fraction of the solvent is high and may be close to one. The present definition also obscures the mole’s utility, and most chemistry textbooks already view mole as an amount of a substance containing an Avogadro number of entities. 015 grams – and the mean mass of one molecule of water is about 18. 18 J/g·°C meaning it takes 4. 7 General chemistry Name Symbol Definition SI unit Notes number of entities N 1 (e. Applications. The approach to the topics will be informal and, we hope, not intimidating. The mole The mole (abbreviation: mol) is used to count particles. There is a big difference between the "ide", "ate" and "ite" suffixes. Of course, it is not actually one, because then we would have a pure substance instead of a solution. Mole definition: A mole is a natural dark spot or small dark lump on someone's skin. Moles are always challenging to deal with, and in a general chemistry class, you usually end up having to perform a lot of conversions involving moles (mol). Facts About Moles A mole or freckle is a section of skin that has a large number of melanocytes, cells that give the skin its characteristic color. This quantity is sometimes referred to as the chemical amount. The word "acid" comes from the Latin acidus , meaning "sour" or "tart," since water solutions of acids have a sour or tart taste. conceptions and understanding of the mole concept and the concentration of solutions, there is a lack of explicit investigation linking both concepts. 01) + (1 x 32. In chemistry, the term mole represents a pile or mass of atoms, molecules, ions or electrons. For example, the mass of one mole of carbon. The mole is the SI unit for the amount of a substance. It is important for all the students who are in Class 11 currently. On a molar basis, we can say that one mole of iron (56g) reacts with one mole of sulfur (32g) to produce one mole of the compound iron(II) sulfide (88g). For a variety of learners, certain formulas become easier to understand. This set of units is referred to as molarity, and is a common measure of concentration for a solute dissolved in a solvent. IMAGE SOURCE: "Chemistry and Life", 4th Edition, John W. conceptions and understanding of the mole concept and the concentration of solutions, there is a lack of explicit investigation linking both concepts. These fundamental units can be atoms, molecules, or formula units based on the substance. Suitable for chemistry and physical science students in grades 9 - 12. May 29, class begins 6:00 p. Moles and the Mole Concept. How to Calculate Percent Yield in Chemistry. of moles of solute present in per litre solution. While the chemical mole might not be as cute as the garden rodent that shares its name, the concept of the mole is the foundation for the field of chemistry. (You may need to draw Lewis structures and geometric sketches to do so. ’ ‘The border of the mole should be smooth, with a clear distinction between skin and the mole. A mole of carbon atoms is 6. This is a very large number: it is 6 with 23 zeros after it. 02 x 10^23 particles -- usually atoms or molecules -- of that substance. Find descriptive alternatives for mole. Oct 20, 2014- Explore addisonweakley's board "Mole Day Ideas" on Pinterest. A dysplastic nevus can have a. Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6. Jokes, history, themes, store—they. Chemistry Dictionary / Glossary! everyone's online source for. 0 mol l-1 or 2. The mole fraction, X, of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution. The mole is the SI unit for the amount of a substance. 01) + (1 x 32. There are no infectious diseases humans can acquire directly from mole droppings. Mole definition: A mole is a natural dark spot or small dark lump on someone's skin. Definition of mole in the AudioEnglish. For every chemical reaction, the molar mass, mole and atom ratio must be constant because it cannot change, they need to be balanced and not bothered because it provides definite answers. Therefore, we can conclude that many, many elements, ranging from light gases like hydrogen and helium to metals like iron, gold, and chromium can be found in a solar spectrum (meaning that the Sun’s atmosphere must contain these elements). 78$means that for every mole of HCl, there are$. Strictly, the mole is the unit of measurement of the physical quantity designated as "amount of substance". Thanks in advance, Rram. The molarity of a substance is a scientific way to talk about how concentrated it is. Mole, standard unit (6. If it were mol L-1 s-2, this would mean moles per litre per second per second. It has few distinctive species, but within its borders the southern mole and cotton-tail rabbit of the South meet the northern star-nosed and Brewers mole s and the varying hare of the North, and the southern bobwhite, Baltimore oriole, bluebird, catbird, chewink, thrasher and wood thrush are neighbors of the bobolink, solitary vireo and the. a branch of chemistry that deals with the application of the laws of definite proportions and of the conservation of mass and energy to chemical …. How to solve mole problems in chemistry worksheet what is the meaning of problem solving 3000 solved problems in physics djvu plumbing business plan samples. It is convenient to think of a chemical mole as such. Multiply mole fractions by 100 for mole percents. How is Moles (chemistry) abbreviated? N stands for Moles (chemistry). One equivalent: In reaction stoichiometry, the amount of one substance that reacts with one mole of another substance. A chopped or mixed combination of weed and tobacco snaped through a bong hit, delivers a sick head rush, aka domer. Mole fraction is defined as the ratio of moles of one components to the total number of moles of all the components present in solution. The mole concept is no more complicated than the more familiar concept of a dozen : 1 dozen = 12 objects. In practice, one mole of any kind of chemical species (atoms, molecules, ions, etc. Everyone is invited to use our website and chemistry dictionary to help further their knowledge, students and teachers alike. These expectations are based on the coefficients of the balanced equation and are expressed as mole-mole conversion factors as shown in the figure. Schools throughout the United States and around the world celebrate Mole Day with various activities related to chemistry and/or moles. Molar mass We cannot count out a mole of particles in the lab, therefore a connection between moles and mass is needed. Mole definition, any of various small insectivorous mammals, especially of the family Talpidae, living chiefly underground, and having velvety fur, very small eyes, and strong forefeet. Rocket propulsion follows Newton’s Third Law, which states that for every action there is an equal and opposite reaction. The term mole literally means a small mass. 012 kg of carbon-12 atoms. Mole definition: A mole is a natural dark spot or small dark lump on someone's skin. The patient is encouraged to regularly inspect areas of the skin that have moles and consult a health care professional about any mole that changes color or shows signs of growth or changes in appearance, as such changes may indicate neoplasm. The study of atoms and its related traits lay the foundation for chemistry. Let's talk about a concept that probably confuses chemistry students the most on some level. Doc Brown's Chemistry - GCSE/IGCSE/GCE (basic A level) O Level Online Percent purity assay Chemical Calculations. The mole is commonly used in titration, a laboratory method in chemistry to determine the concentration of some substance in a solution. Updated August 2019. Search the history of over 380 billion web pages on the Internet. 1 "The Chemical Equation" , we stated that a chemical equation is simply a recipe for a chemical reaction. , molle (early 13c. The interconversion between mass, moles, number of atoms or molecules, and volume is described. 012 kg) of C-12, the most common naturally-occurring isotope of the element carbon. So why do chemists use moles, and why do you need a mole calculator? Well, as we said above, it provides a useful metric when dealing with reactions. It has few distinctive species, but within its borders the southern mole and cotton-tail rabbit of the South meet the northern star-nosed and Brewers mole s and the varying hare of the North, and the southern bobwhite, Baltimore oriole, bluebird, catbird, chewink, thrasher and wood thrush are neighbors of the bobolink, solitary vireo and the. Chemistry Vocabulary - Common chemistry terms explained. molechemistry. Mole ka matalab hindi me kya hai (Mole का हिंदी में मतलब ). Chemistry is at the heart of making rockets fly. If you have 1 mole of carbon atoms, then that would mean you have approximately 6. Strictly, the mole is the unit of measurement of the physical quantity designated as “amount of substance”. Definition of mole noun in Oxford Advanced Learner's Dictionary. Science · Chemistry How to use mole ratios from a balanced reaction to calculate amounts of reactants If you're seeing this message, it means we're having. 02 10 23 carbon atoms, in a pile, weigh 12 grams. Clinical Chemistry -- Terms and Conditions for Use. If the temperature of the calorimeter changes from. Information about mole in the AudioEnglish. New search features Acronym Blog Free. ERIC is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U. Choose from 500 different sets of definition chemistry chapter 10 mole flashcards on Quizlet. 4)1 mole of blood cells would be more than the total number of blood cells found in every human on earth 5)1 mole of sheets of paper could form a million stacks from the surface of the earth, all that would pass the sun 6)1 mole of sheets of paper could form a million stacks from the surface of the earth, all that would pass the sun. How to solve mole problems in chemistry worksheet what is the meaning of problem solving 3000 solved problems in physics djvu plumbing business plan samples. A mole is simply put, an amount of a substance. The units are mole per liter. 02 x 10^23 particles. IB Chemistry notes on stoichiometry and the mole concept. Recently, I came across the unit J/(kg-mole * K). 022140857 x 10 23 of carbon atoms (to 10 significant figures). Papa mole sticks his head out the entrance, & says I smell maple syrup! Mama mole does the same thing, & says I smell honey! Baby mole in the back, says I smell mole-asses!!! Mole Day Dictionary Demoleition: The destruction which moles bring about in your yard. 000 amu, then one mole of these atoms would have a mass of 12. Jeremias. Whether you're converting from moles to grams, moles to volume, or moles to particles (atoms or molecules), use this quick guide to remind. When combined with educational content written by respected scholars across the curriculum, Mastering Chemistry helps deliver the learning outcomes that students and instructors aspire to. Or, if you have. The equivalent weight may be equal to the formula weight (molecular weight, mole weight) of the substance or equal to an integral fraction of the formula. A mole corresponds to the mass of a substance that contains 6. $\mathrm{mol \times L^{-1}}$ is more conveniently written $\mathrm{mol/L}$. Understanding the somewhat abstract idea of the mole as a unit of quantity can be tricky but is key to success as a chemist or chemistry student. The molar mass of an element is found on the periodic table, and it is the element's atomic weight in grams/mole (g/mol). Molecules are made up of two or more atoms chemically bonded together. One mole is defined as the amount of substance containing as many elementary. A moles means a "permanent small dark spot on the human body" as defined in the English dictionary. This mole uses exactly the same ingredients as mole negro but without blackened chile seeds and stems. The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution. Chemistry B Salters Chemistry for life British AS-Level - 50 cards Chemistry B Salters Chemistry Of Nat Rec British AS-Level - 80 cards Chemistry C101 - Exam 2 (ch. Their new definition is based on a specified number of elementary entities. Turns out that memorising that definition for my GCSE chemistry exam was pointless. One equivalent: In reaction stoichiometry, the amount of one substance that reacts with one mole of another substance. For example, carbon's atomic weight is roughly 12 amu; this means that 6. Updated August 2019. The Mole Ar And Mr 1. 022 x 10^23 carbon atoms. In chemistry, molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a solute in a solution, or of any molecular, ionic, or atomic species in a given volume. Unit = Moles per lit. just a dozen a dozen means 12 right? but 12 what? does it have to be eggs? no it does not. In chemistry and physics, atomic theory is a theory of the nature of matter, which states that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity. 022*10^23 atoms, or molecules, or ions, or. Your Math (mathematics) is made easy here. As a general rule an "ide" suffix indicates an element. For those of you who are not familiar with it, let me explain. The scientific definition of molar mass is: The mass of one mole of a substance, usually expressed in grams or kilograms. The number of moles of solute in solution is given by the formula. Stephen Lukacs (November 2013) The key currency of chemical amounts is known as the mole. Chemistry mole - some interesting facts Theoretically, a mole is represented by the number 6. For every mole of nitrogen reactant, a chemist expects 2 moles of ammonia product. STOICHIOMETRY AND PERCENT PURITY Many samples of chemicals are not pure. If we know the balanced chemical reaction, then the n-factor calculation is of no use because problem can be solved using mole concept. Mastering Chemistry is the teaching and learning platform that empowers you to reach every student. Until now, a mole has been defined with reference to a specified mass. For example, to determine the number of moles of water produced from 2 mol O 2, the balanced chemical reaction should be written out:. It is known as the Avogadro number. In chemistry, a mole is 6. One mole of elemental nitrogen reacts with three moles of elemental hydrogen to produce two moles of ammonia. How long could we expect these HCl molecules to last compared to HI. Avogadro hypothesized that there was a specific number that would represent the number of atoms or molecules in a mole of that atom or molecule. The following assumptions were made in drawing of the syllabus: (1) That candidates must have covered the Integrated Science/Basic Science or General. Its symbol is mol. The mole is used in chemistry to represent 6. To completely understand what the above definition means, one must know what the chemistry term - 'mole' of a substance is. The delta symbol is used to represent change. 1 g/mol 1 mole of Carbon is 12. Watch this video and then complete the "Think" questions that follow. The relationship between two of the reaction's participants (reactant or product) can be viewed as conversion factors and can be used to facilitate mole-to-mole conversions within the reaction. Even though the mole cricket nymphs are wingless, they look like adults. It was not considered an SI unit (with an IUPAC definition) until 1971. 02x10 23 carbon atoms. Use this page to learn how to convert between millimoles and moles. This particular mole has two names which invariably give away the meaning of having a mole in this position. Define mole. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, or other particles,. 023 X 10 23). Molecule: A molecule is a chemical species that is formed due to a combination of several atoms through chemical bonding. The molar mass is used to convert grams of a substance to moles and is used often in chemistry. 02 \times 10^{23}\$ molecules of that substance. Everyone is invited to use our website and chemistry dictionary to help further their knowledge, students and teachers alike. 022x1023 molecules), abbreviated mol. Mole vs Molarity. 0821 dm 3 atm of energy , dm3 atm being the unit of energy. In November 2018, the revised definition was approved, and it will subsequently come into force on 20 May 2019. 022 140 76 x 10 23 specified elementary entities. Most of the other types of measurements are combinations of them, including density, molecular weight, molarity, and percent composition. At the American Chemical Society (ACS), our vision is to improve people's lives through the transforming power of chemistry. 022*10^23 atoms, or molecules, or ions, or. 2) type of small burrowing insectivorous mammal (genus Talpa), mid-14c. Another area is biochemistry. 023 x 10 23 particles of the substance. 022169 x 10 23 , and is also called the. Watch for moles that change in size, shape, color or height, especially if part or all of a mole turns black. According to Chinese face reading, the round and raised moles with good brightness in pure red or dark black are auspicious and this kind of moles are commonly seen on the emperors. Molality is defined as the “total moles of a solute contained in a kilogram of a solvent. The mole The mole (abbreviation: mol) is used to count particles. Why is the mole of Na+ ions in. In practice, one mole of any kind of chemical species (atoms, molecules, ions, etc. The mole is an important unit in chemistry. A moles means a "permanent small dark spot on the human body" as defined in the English dictionary. Moles are growths. An example of good chemistry is when a character throws the ball to its buddy, the ball travels faster than normal, glows purple, and leaves a purple trail. 4)1 mole of blood cells would be more than the total number of blood cells found in every human on earth 5)1 mole of sheets of paper could form a million stacks from the surface of the earth, all that would pass the sun 6)1 mole of sheets of paper could form a million stacks from the surface of the earth, all that would pass the sun. It is the base of the stoichiometry and it is the best option for expressing amounts of reactants and products consumed and formed during a chemical reaction. Atoms, ions & quanta At university you will delve into the strange world of quantum mechanics, and how it has shaped our modern understanding of electrons, atoms and bonding. The mole is nothing more than a unit of measurement in chemistry, and I hope this. mole: the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon 12 isotope. Overview: In this module, we introduce the mole, a unit of measure that is used extensively in chemistry. 000 amu, then one mole of these atoms would have a mass of 12. This video describes the meaning and functionality of Avogadro's number in chemistry. Use blue spirits for best dome. Mole Fraction formula , definition and examples. A mole of carbon atoms is 6. 022 140 76 × 10 23 molecules, whose total mass is about 18. The mole enables us to count atoms in the laboratory. Mole, standard unit (6. From the penny example above one might suspect that the mass of a mole of objects is huge. Atomic mass is the concept related to a single atom, whereas molecular mass relates to a group of atoms. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6. Calculate things online with just mouse moves. Relative atomic mass, A r Atoms are very tiny particles. 26 then one mole of that molecule would have a mass of 175. To completely understand what the above definition means, one must know what the chemistry term - 'mole' of a substance is. Information about mole in the AudioEnglish. 02 x 10 23 of them to be exact. When the relative humidity and temperature are given, we can use data from the Steam Tables to determine the partial pressure and mole fraction of water in the gas phase. The International Union of Pure and Applied Chemistry (Iupac) recommends revising the definition of the mole. This is the important aspect of the mole. A mole of chemistry teachers is 6. 02 x 10^23 particles -- usually atoms or molecules -- of that substance. This is known as the molar mass, M, and has the units g mol-1 (grams per mole of substance). Mole: A mole is the quantity of anything that has the same number of atoms present in 12. Precipitation from a fluid like H 2 O or CO 2. How many grams are in 3. 02214129(27) x 10 23. mole - WordReference English dictionary, questions, discussion and forums. In chemistry, molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a solute in a solution, or of any molecular, ionic, or atomic species in a given volume. Similarly, a mole refers to a specific quantity-- its distinguishing feature is that its number is far larger than other common units. View the pronunciation for mole. a small mammal that is almost blind, has dark fur, and lives in passages that it digs…. A skin lesion, commonly a nevus, that is typically raised and discolored. mole (plural moles) ( chemistry , physics ) In the International System of Units , the base unit of amount of substance; the amount of substance of a system which contains as many elementary entities (atoms, ions , molecules , etc. Good examples of units can include: area, measured in m 2, or metres squared; volume, measured in m 3, or metres cubed. What is your definition of the term "mole" in chemistry? Many articles have been written about the term and the confusion surrounding it. Also, the red. In this S N 2 reaction, one mole of CH 3 Cl reacts with one mole of NaI to produce one mole of CH 3 I and one mole of NaCl. Let's start with the definition of mole fraction. An itching mole can be a sign of a melanoma, or cancerous skin growth, but the vast majority of moles are harmless. Recently, I came across the unit J/(kg-mole * K). If you want to contact me, please use the contact form contact form. Learn more. These changes are the source of radioactivity and nuclear power. 6 Chemical Equation Meaning - Free download as Powerpoint Presentation (. Updated August 2019. Moles are found on many parts of the body and can be of honey colour, red, black and sometimes wheatish and pale in colour. But on some level it's also one of the simplest concepts. | Meaning, pronunciation, translations and examples. Thus, we can read this reaction as "two moles of hydrogen react with one mole of oxygen to produce two moles of water. In chemistry, the mole is the standard measurement of amount. The interconversion between mass, moles, number of atoms or molecules, and volume is described. For a variety of learners, certain formulas become easier to understand. Mole has more than one meaning. Why is the mole of Na+ ions in. From the penny example above one might suspect that the mass of a mole of objects is huge. What does RFM stand for in Chemistry? Top RFM acronym definition related to defence: Relative Formula Mass. Recently, I came across the unit J/(kg-mole * K). Quantitative chemistry calculations Help for problem solving in doing % percentage purity calculations. Unlike covalent bonds, ionic bonds do not form molecules in the same way that covalent bonds do. The molar mass is used to convert grams of a substance to moles and is used often in chemistry. Let us proceed!. Mole definition: A mole is a natural dark spot or small dark lump on someone's skin. The relative formula mass of a compound is calculated by adding together the relative atomic mass values for all the atoms in its formula. 022×10 23 atoms of the element, both represent 1 mole of element. View the pronunciation for mole. Chemists use equivalent units, or equivalents, to express the contribution of an acid or base to the total acidity or alkalinity of a solution. The solute may be a solid (ionic or covalent), a gas or a liquid, but is commonly a solid.