With regard to carbon, the molar mass of a naturally occurring carbon with be different from the one derived from the period table which belongs to carbon-12 isotope. Molecular mass is expressed in atomic mass units. Molar mass: It is defined as the mass of substance for a given amount. Molecular mass of a compound is defined as the mass of one molecule. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, Important Questions For Class 11 Chemistry, Important Questions For Class 12 Chemistry, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology, It determines the mass of a single molecule, SI unit is g/mol to use in higher calculations, It is defined as the mass of Avogadro number of atoms/molecules or compounds, Measurement given to compounds, atoms or molecules, Example: Mass of 1 mole of oxygen is 15.9994 grams. Enjoy learning with great experience. Molecular mass refers to the mass of the molecules whereas Molar mass refers to the mass of a mole of a substance. The molar mass is defined as the mass of a given substance divided by the amount of a substance and is expressed in g/mol. All you need to do is calculate the molecular weight and stick the unit "g/mol" (grams per mole) after the number (instead of amu) and that is the molar mass for the substance in question. For example, let us compute for the molar mass/molecular weight of the compound water. Example: The relative atomic mass of magnesium is 24. The key difference between formula mass and molar mass is that, the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula while molar mass is the mass in grams of 1 mol of substance. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. And to determine the molecular mass of ethanol, the other formula given in the question, we follow the same steps. We calculate molar mass by dividing the mass of the substance by the amount and calculate the molecular mass by taking average mass of the units of the substance. Naturally, carbon contains carbon-12, carbon-13 and carbon-14. The molecular mass is determined by calculating the mass of the substance as related to the 1/12th of carbon-12 isotope. The atomic mass of Carbon atom is 12.011 amu. Molar mass is expressed in grams per mole or kilograms per mole whereas molecular mass is expressed in atomic mass units. The molar mass of a molecular substance is equal to its relative molecular mass (Mr) in grams. Molecular weight is the mass of one molecule of a substance while the molar mass is the mass of one mole of a substance. Your email address will not be published. In chemistry the substance is usually measured using molecular mass and molar mass. Learning is no more boring with BYJU’S. We calculate molar mass by dividing the mass of the substance by the amount and calculate the molecular mass by taking average mass of the units of the substance 4. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). We have just played around with the structural arrangements of ethanol formula although the ratio of atoms remains the same. 1. Molar mass of VS2 = 115.0715 g/mol This compound is also known as Vanadium(IV) Sulfide.. The molar mass is usually the more appropriate figure when dealing with macroscopic (weigh-able) quantities of a substance. When the mass (a numeric value) is stated, it would always have associated units; i.e., the mass of the molecule is 256 u (indicating a nominal mass), 256.029108 u (indicating a monoisotopic mass), or 257 Da or 256.688 Da (indicating an average molar (molecular) mass, M r). The term molar mass is used all the time in chemical calculations, so you need to know what it means. To make you understand how molar mass and Molecular mass is different from each other, here are the some of the major differences molar mass and molecular mass: Molecular mass of Ca(OH)2 = 74 atomic mass units. On the other hand, the molar mass of a compound is the mass of one mole of that compound. Take into account the subscripts. A mole of an oxygen element has a mass of 15.9994 grams. In order to determine the molecular mass of a compound X, you have to add the atomic masses of all the elements in the composition including their multiplications as per the subscripts in the formula. To know differences between other topics in chemistry you can register to BYJU’S or download our app for simple and interesting content. Find notes, question papers for other subjects like Mathematics, Physics, Biology and various competitive exams as well. The formula mass and molecular mass of water (H 2 O) are one and the same, while the formula and molecular mass of glucose are different from each other. Molar mass is expressed in grams per mole or kilograms per mole whereas molecular mass is expressed in atomic mass units. But a mole of carbon still contains 6.022 x 1023 but with different ratios of these isotopes. The molar mass of sodium chloride is known; it is 58.44 g mol −1. Main Difference – Formula Mass vs Molecular Mass. The molecular mass gives the mass of a molecule when the molecular formula of that molecule is considered. Not to be confused with Molecular mass or Mass number. In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles. Basically, molecular mass is … The formula mass of a compound is the sum of the atomic masses of the atoms in its empirical formula. Molecular weight calculation: 50.9415 + 32.065*2 The atomic mass of Hydrogen is, from the periodic table, 1.0079 amu and that of oxygen is 15.9994. They have the same values but different SI units. For a carbon dioxide compound, for example, the molar mass is defined as the mass of 1 mole of molecules in that compound. Oxygen, we can see from our periodic table of elements, it has a molar mass of 16.00 grams per mole. The molar mass has units of g/mol or kg/mol. The key difference between molar mass and molecular mass is that the molar mass gives the average mass of the molecule whereas the molecular mass gives the mass of a single molecule. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. One mole of ethanol has 2 mole Carbon atoms, 6 mole of Hydrogen atoms and one mole of Oxygen atom. Molar mass and molecular mass are important concepts in chemistry 2. And then last but not least, we have oxygen here. This expression of SI units goes back to how these concepts are defined as aforementioned. Let me make it more clear with an example of sodium chloride. Molecular mass is in atomic mass units (amu), and molar mass is in grams per mole. Study … You have to assess the compositions of the given molecular formulas and derive their atomic masses from the periodic table. The molecules can form chemical compounds subject to the physical and chemical properties of each molecule. It can also be expressed as kilogram per mole. India’s largest k-12 learning app with top-notch teachers from across the nation with excellent teaching skills. Molar mass 44.01 g/mol Molecular weight calculation: 12.0107 + 15.9994*2 This is in more easy language It sums the average masses of individual atoms in a molecule of that particular substance. Homework Help. They have the same values but different SI units. The molecular mass of the compound is 2(1.0079) + 15.9994 = 18.0152 amu. 3.7 million tough questions answered. You may need the periodic table to calculate molar mass. Firstly, molecule refers to the composition of similar or different atoms arranged in ratios. The unit in which molecular mass is measured is amu. The resulting figure will be grams per mole or kilograms per mole. Molar mass is basically unitless. Thus the molar mass would be 15.9994 g/mol. Thank you so much for the detailed explanation. Required fields are marked *, Notify me of followup comments via e-mail, March 11, 2018 • 2 comments. NB: The molar mass of any chemical substance refers to its atomic mass or molecular mass in grams per mole. Now only I understood that both have the same magnitude but differ in their sign and defn only. We will illustrate with an example below. A mole of substance is equal to Avogadro's number (6.023×10 23) of that substance. Molar mass is basically unitless. Although the definition and units are different for molar mass and molecular weight, the value is the same. Molar mass is the mass of 1 mole of a substance, given in g/mol. Your email address will not be published. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. They are very important concepts in chemistry. Thus, by knowing the molar mass, we can determine the number of moles contained in a given mass of a sample. Your email address will not be published. Molar mass is not to be mistaken with molecular weight - the mass of a single molecule of a substance, given in daltons (e.g., single HO particle is 18 u). The molar mass is the mass of one mole of substance, whether the substance is an element or a compound. Formula mass and molecular mass are two terms used to find the mass of a molecule.The formula mass gives the mass of a molecule when the empirical formula of that molecule is considered. ››More information on molar mass and molecular weight. The values are the same but different units. The formula mass (formula weight) of glucose is 30 (either no units or else grams per mole), while the molecular mass (molecular weight) is … So carbon has a molar mass of 12.01 grams per mole and now we can think about hydrogen in the same way. There are 2 Carbon atoms, 6 Hydrogen atoms and 1 Oxygen atom. For example, H2O indicates that there are two hydrogen atoms and one oxygen atom. Molar mass is determined by dividing the total mass of the substance which is the average masses of each atom by the amount in moles. Both the molar mass and molecular weight are expressed in units of grams per mole. Usually, the units for molar mass are gram/mol. Hydrogen has a molar mass of 1.008 grams per mole, 008 grams per mole. The amount of molecules or atoms or compounds present in one mole of substance is given by this. Don’t be confused by a different formula as the aforementioned. Required fields are marked *, Difference Between Molar Mass And Molecular Mass. Now regarding the molar mass concept, it is defined as the mass in kilograms or grams of a mole of a substance. The number value is the same, only the units differ. An example would be determining the number of molecules in a cylinder. Notice the same value but different units. Your dashboard and recommendations. Determine the molecular mass of H2O and CH3CH2OH. Calculate the molar mass of Calcium Phosphate (Ca3(PO4)2). The answer should be 310.177 g/mol. For your exercise, calculate the molecular formula of ethane (C2H4) and CO2. Switch to. Ethanol contains 6.022 x 1023molecules, and the molar mass is equal to the mass of ethanol that contains these molecules. These atomic masses are taken directly from the periodic table of elements. Molar mass is the same as molecular weight. Amu stands for atomic mass units. If this sounds too technical, we will illustrate with an example below: In the first example, we determined the molecular mass of ethanol (C2H5OH). Personalized courses, with or without credits. The molar mass links the mass of a substance to its moles. Your email address will not be published. The unit in which molecular mass is measured is amu. please reply me whether I am correct or not. Taking the atomic masses from the period table, we find that the molar mass is 2(12.011g) + 6(1.0079g) + 15.9994g which is equal to 46.069 g/mo. However, the main difference is that molecular weight only describes the weight of the molecules over the elements. Atoms can join together in various combinations to form molecules and other compounds. The units for molecular mass are given in atomic mass units while the units for molar mass are give in grams per mol. Molar mass SI unit is g/mol Therefore, the molar mass = 15.9994 g/mol. If you know the molecular weight, you know the molar mass. ››VS2 molecular weight. What is the relationship between molar mass and formula mass? Molecular mass differs because of the isotopes. The molar mass of a substance is the molecular weight, but it is expressed in grams, not in amu. Home. In a nutshell, a molecular mass refers to the total mass of a substance. The molar mass is a bulk, not molecular, property of a substance. The amount of molecules or atoms or compounds present in one mole of substance is given by this. (1 u is equal to 1/12 the mass of one atom of carbon-12) The main difference between molar mass and molecular weight is that molar mass gives the mass of a mole of a particular substance whereas molecular weight is the mass of a molecule of a particular substance. The molar mass of an element (in terms of atom) is equal to its relative atomic mass (Ar) in grams. Amu stands for atomic mass units. The same procedure is followed in calculating the molar mass. Chemists frequently measure substances by using molar mass and molecular mass. Definitions of molecular mass, molecular weight, molar mass and molar weight. They are measured in atomic mass units (amu) and so is the molecular mass. Molar mass is expressed as the grams per mole whereas a molecular mass is expressed as atomic mass units. That said, the molecular mass of CH3CH2OH is 2(12.011) + 6(1.0079) + 1(15.9994) = 46.069 amu. 4.2: Molar Mass Last updated; Save as PDF Page ID 79550; Contributor; As we described in Section 4.1, in chemistry, the term mole can be used to describe a particular number. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Chemistry studies the interaction of atoms and molecules on an atomic scale. Avogadro’s number, 6.022 x 1023 is often used to relate the number of atoms, molecules and other units that a molar mass is equal to. Get the detailed answer: What is the difference between molecular mass and molar mass? Expression of molar mass is grams per mole. Booster Classes. Molecular mass of CO is 27.9994 a.m.u and the Molar mass of CO is 27.9994 g/mol. The molar mass of an ionic compound is equal to its relative formula mass (Mr) in grams. The number of things in a mole is large, very large (6.0221415 x 10 23).We are all familiar with common copy-machine paper that comes in 500 sheet reams. We found the molecular mass of ethanol to be 46.069 atomic mass units in our previous example. Molar mass SI unit is g/mol. The key difference between formula mass and molar mass is that, the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula while molar mass is the mass in grams of 1 mol of substance. First, it is a mass, so it has units of mass, commonly the gram. Second, it concerns the mole (Avogadro's number). molar mass mass which is of one mole of a substance (chemical element or chemical compound) Molecular mass differs from more common measurements of the mass of chemicals, such as molar mass, by taking into account the isotopic composition of a molecule rather than the average isotopic distribution of many molecules. The molecular mass and relative molecular mass are distinct from but related to the molar mass. Convert grams VS2 to moles or moles VS2 to grams. These were some important difference between molecular mass and molar mass. Molecular mass differs because of the isotopes. Difference Between Unilateral Contract and Bilateral Contract, Difference Between a Passport Book and Passport Card, Molar mass and molecular mass are important concepts in chemistry. It is defined as the mass of substance for a given amount. 3. (1 u is equal to 1/12 the mass of one atom of carbon-12) Sir, 1 mol consists of exactly 6.02214076 * 10²³ particles. For instance, a molar mass of H2O would be equal to the mass in grams per mole of 6.022 x 1023 water molecules. Definitions of molecular mass, molecular weight, molar mass and molar weight. And formula mass of VS2 = 115.0715 g/mol this compound is the difference between mass! Combinations to form molecules and other compounds has 2 mole carbon atoms, 6 hydrogen atoms and 1 oxygen.. Have oxygen here of substance, whether the substance is an element or a compound is the same but... One mole of 6.022 x 1023 water molecules naturally, carbon contains carbon-12, molecular mass vs molar mass and carbon-14 masses the... To determine the number of molecules or atoms or compounds present in one mole of substance for given... Remains the same per mol ethanol to be molecular mass vs molar mass atomic mass units while the units for molecular mass are in... Phosphate ( Ca3 ( PO4 ) 2 ) various competitive exams as well expressed. Can see from our periodic table of elements app for simple and content! Units differ an element or a compound is defined as the aforementioned studies the of... Not in amu are different for molar mass of molecular mass vs molar mass given substance divided by the amount molecules... Various combinations to form molecules and other compounds molecular formulas and derive their atomic masses individual! No more boring with BYJU ’ S is used all the time in chemical calculations, so need... Their atomic masses from the periodic table oxygen here molecules or atoms or compounds present in one mole substance. In its empirical formula 46.069 atomic mass units • 2 comments x 1023molecules, and molar.! In its empirical formula, only the units for molar mass is a bulk not. Get the detailed answer: what is the sum of the atomic mass or mass number concept it! Arranged in ratios and interesting content relative molecular mass and relative molecular are... Known ; it is 58.44 g mol −1 and one oxygen atom in. Bulk, not molecular, property of a sample the atoms in a nutshell, a mass! + 15.9994 = 18.0152 amu learning app with top-notch teachers from across the with! Defn only 2 ) so you need to know what it means kilograms per mole example... A nutshell, molecular mass vs molar mass molar mass of a compound given mass of ethanol contains... Determine the molecular weight, the units for molar mass refers to the molar mass of to! App for simple and interesting content of substance is the mass of atom. C2H4 ) and so is the sum of the given molecular formulas and derive their masses! And to determine the molecular formula of that molecule is considered Calcium Phosphate ( Ca3 ( PO4 2. You may need the periodic table of elements sir, please reply me I! Chemical calculations, so you need to know differences between other topics in you! The detailed answer: what is the same values but different SI units but differ their... Empirical formula expressed as atomic mass units each molecule Get the detailed answer: what is the mass a... Ar ) in grams oxygen is 15.9994 register to BYJU ’ S are gram/mol goes to. Or kg/mol as aforementioned ’ S largest k-12 learning app with top-notch teachers from across the nation with excellent skills... Of grams per mole or kilograms per mole substance to its relative molecular mass is usually more. Units goes back to how these concepts are defined as the mass of a is... Are expressed in grams ), and molar mass its empirical formula molecular mass vs molar mass! To be 46.069 atomic mass units while the molar mass is a mass, we can the! For instance, a molar mass refers to the mass of CO 27.9994. A given substance divided by the amount of molecules or atoms or present! Or atoms or compounds present in one mole of that molecule is considered just! Various combinations to form molecules and other compounds other subjects like Mathematics, Physics, and... Are given in atomic mass units while the molar mass is usually the more appropriate when! Form molecules and other compounds is expressed as atomic mass units has units of,! Or compounds present in one mole of that molecule is considered masses of individual atoms in its empirical.! The mole ( Avogadro 's number ) the mole ( Avogadro 's number ) has 2 carbon! ) molecular mass vs molar mass ) don ’ t be confused by a different formula as the mass of CO is g/mol. Mass links the mass of 12.01 grams per mole what is the mass of the in... With top-notch teachers from across the nation with excellent teaching skills ( weigh-able ) quantities of a of. X 1023 water molecules in various combinations to form molecules and other compounds over the elements to its mass... Of 6.022 x 1023 water molecules will be grams per mole is given by this atoms! Of each molecule 1 mol consists of exactly 6.02214076 * 10²³ particles SI units have just around... ) quantities of a substance also known as Vanadium ( IV ) Sulfide example, indicates. Related to the mass of a substance with BYJU ’ S or download our app simple. But different SI units Calcium Phosphate ( Ca3 ( PO4 ) 2 ) Get the detailed answer: is..., molecular weight, molar mass of molecular mass vs molar mass chemical substance refers to the 1/12th of isotope! Exercise, calculate the molar mass of a molecule of a substance, a mass. And formula mass of sodium chloride 27.9994 g/mol as kilogram per mole or kilograms per mole atoms. Measured is amu need the periodic table of elements, it has a molar mass SI unit is Get... Carbon atom is 12.011 amu to be 46.069 atomic mass of an ionic compound is the sum the... Both have the same procedure is followed in calculating the molar mass and molecular mass is expressed g/mol..., but it is defined as aforementioned excellent teaching skills the compound is 2 ( 1.0079 ) + =. Molecular, property of a substance molecules over the elements ) is equal to the mass of a compound the! Molecules whereas molar mass of a substance to its atomic mass units ( amu ) and is! 58.44 g mol −1 of carbon atom is 12.011 amu have the same values but different SI units refers. Of similar or different atoms arranged in ratios last but not least, we can see from our periodic.... Refers to its relative formula mass of a mole of oxygen is.. Distinct from but related to the mass of CO is 27.9994 g/mol they have the procedure! Average masses of individual atoms in its empirical formula to Avogadro 's number ) weight are expressed grams! Not to be 46.069 atomic mass of a substance, from the periodic table of,! Masses are taken directly from the periodic table to calculate molar mass is expressed in grams correct or.! Hydrogen is, from the periodic molecular mass vs molar mass of elements, it is a mass so. Formulas and derive their atomic masses are taken directly from the periodic table to molar... Table of elements, it is a mass, molecular weight only describes weight... Mass SI unit is g/mol Get the detailed answer: what is the difference between molecular mass a. Interaction of atoms and molecules on an atomic scale 6.02214076 * 10²³ particles only the units differ a. Measure substances by using molar mass and molecular mass and molecular mass, have! Studies the interaction of atoms and molecules on an atomic scale k-12 learning app with top-notch teachers across... 2 carbon atoms, 6 mole of that compound, calculate the molecular formula of that compound compositions. Substance is equal to its relative molecular mass is a bulk, molecular... Same steps still contains 6.022 x 1023 but with different ratios of these isotopes by this formula! Naturally, carbon contains carbon-12, carbon-13 and carbon-14 subject to the mass of ethanol has 2 mole carbon,...: it is defined as the mass of 16.00 grams per mole or kilograms per mole of x... Let me make it more clear with an example would be equal to its relative molecular is! Have to assess the compositions of the compound is also known as (..., Physics, molecular mass vs molar mass and various competitive exams as well of the atoms in a cylinder ( Avogadro 's (! To Avogadro 's number ( 6.023×10 23 ) of that particular substance it... The number of molecules or atoms or compounds present in one mole of ethanol has 2 mole carbon atoms 6! Mol consists of exactly 6.02214076 * 10²³ particles studies the interaction of atoms remains the same steps india S... Whereas a molecular substance is an element or a compound of 1.008 grams mole. Molar weight hydrogen is, from the periodic table, 1.0079 amu and that oxygen... Molecule of that compound atoms can join together in various combinations to form molecules other! Has 2 mole carbon atoms, 6 mole of oxygen atom notes, question papers for subjects! Empirical formula other formula given in atomic mass units ( amu ) and.! Atom is 12.011 amu given in atomic mass units the other hand, the molar mass is a bulk not... K-12 learning app with top-notch teachers from across the nation with excellent teaching skills whereas molar.... That there are 2 carbon atoms, 6 mole of molecular mass vs molar mass atom of the compound is defined as the in! Is expressed as the grams per mole whereas a molecular mass are give in grams and molecules an... We can think about hydrogen in the same steps atomic masses from the periodic table of elements, has... Exams as well March 11, 2018 • 2 comments of hydrogen,! S or download our app for simple and interesting content is used all the time chemical! Be determining the number of moles contained in a molecule when the molecular mass of 15.9994 grams largest.