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Name:__________________________________ Date:____________ Per:____
Molar Mass Assignment
Example showing how to find molar Mass:
Example and steps: Ca(OH)2
Step 1: Identify the different elements in the given compound and the number of moles
for each one. (remember to distribute if you have parenthesis)
1 mol Ca x
2 mol O x
2 mol H x
40.078 = 40.078
15.999 = 31.998
1.0079 = 2.0158
74.0918 g/mol
Step 2: Multiply the number of atoms of each element by that element’s atomic mass.
(Round the masses to the nearest hundredth—2 numbers after the decimal)
Step 3: Add all multiplied amounts and place the proper unit (grams per mole – g/mol)
Determine the molar mass of each of the following compounds. Round your answers to
the nearest hundredth and provide the proper units.
1.) C4H10
2.) Al2(SO4)3
4_ mol C x 12.011__ g = _________g/mol
___Al x ____ g = ______g/mol
10_mol H x 1.0079___g = _________g/mol
___S x _____g = ______g/mol
Answer =
___O x _____g = ______g/mol
Add all for answer = _______g/mol
3.) Li2CO3
4) Ba(OH)2
5) Al(NO3)3
6) CaCl2
Name:__________________________________ Date:____________ Per:____
Molar Mass Assignment
Example showing how to find molar Mass:
Example and steps: Ca(OH)2
Step 1: Identify the different elements in the given compound and the number of moles
for each one. (remember to distribute if you have parenthesis)
1 mol Ca x
2 mol O x
2 mol H x
40.078 = 40.078
15.999 = 31.998
1.0079 = 2.0158
74.0918 g/mol
Step 2: Multiply the number of atoms of each element by that element’s atomic mass.
(Round the masses to the nearest hundredth—2 numbers after the decimal)
Step 3: Add all multiplied amounts and place the proper unit (grams per mole – g/mol)
Determine the molar mass of each of the following compounds. Round your answers to
the nearest hundredth and provide the proper units.
1.) C4H10
2.) Al2(SO4)3
4_ mol C x 12.011__ g = _________g/mol
___Al x ____ g = ______g/mol
10_mol H x 1.0079___g = _________g/mol
___S x _____g = ______g/mol
Answer =
___O x _____g = ______g/mol
Add all for answer = _______g/mol
3.) Li2CO3
4) Ba(OH)2
5) Al(NO3)3
6) CaCl2