Molar Mass Worksheet – Answer Key Calculate the molar mass of the following chemicals: 1) Cl2 71 g/mol 2) KOH 56.1 g/mol 3) BeCl2 80 g/mol 4) FeCl3 162.3 g/mol 5) BF3 67.8 g/mol 6) CCl2F2 121 g/mol 7) Mg(OH)2 58.3 g/mol 8) UF6 352 g/mol 9) SO2 64.1 g/mol 10) H3PO4 98 g/mol 11) (NH4)2SO4 132.1 g/mol 12) CH3COOH 60 g/mol 13) Pb(NO3)2 331.2 g ...

6) What is the molar mass of MgO? 7) How are the terms “molar mass” and “atomic mass” different from one another? 8) Which is a better unit for expressing molar mass, “amu” or “grams/mole”?

“Molar mass” is used to describe the mass of one mole of a chemical compound, while “atomic mass” is used to describe the mass of one mole of an element or the mass of one atom of an element. 8) Which is a better unit for expressing molar mass, “amu” or “grams/mole”?

Solutions to the Molar Mass Practice Worksheet: Important note to students: All of the units given here are “grams per mole”, which may be abbreviated as “g/mol”, “grams/mol”, or “g . mol -1 ”, depending on

U3-LM2B-WS Molar Mass and Conversions Name:_____KEY_____ 1. The molar mass of chlorine is: 2 x 35.45 g/mol Cl = 70.90 g/mol Cl 2 (Remember that chlorine exists as a diatomic molecule in nature) 2. The molar mass of carbon dioxide is: 12.01 g/mol C + (2 x 16.00 g/mol O) = 44.01 g/mol CO 2 3. The molar mass of aluminum carbonate, Al 2(CO 3) 3, is:

Molar mass tells us the mass (“weight”) of 1 mol of an atom or compound. In each case we simply calculate the sum of the “weights” of the atoms in the formula to determine the weight of a mole. These weights can be found on the periodic table. EXAMPLE: Calculate the molar mass (gram molecular weight) of a mole of iodine, I 2. Round to 2 ...

All answers are to 4 significant figures.