Molar Mass Test Questions

Chemistry Test Questions

The molar mass of a substance is the mass of one mole of the substance. This collection of ten chemistry test questions deals with calculating and using molar masses. The answers appear after the final question.
A periodic table is necessary to complete the questions.

Question 1

Molecule model on Periodic table
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Calculate the molar mass of CuSO4.

Question 2

Calculate the molar mass of CaCOH.

Question 3

Calculate the molar mass of Cr4(P2O7)3.

Question 4

Calculate the molar mass of RbOH·2H2O.

Question 5

Calculate the molar mass of KAl(SO4)2·12H2O.

Question 6

What is the mass in grams of 0.172 moles of NaHCO3?

Question 7

How many moles of CdBr2 are in a 39.25 gram sample of CdBr2?

Question 8

How many atoms of cobalt are in a 0.39 mole sample of Co(C2H3O2)3?

Question 9

What is the mass in milligrams of chlorine in 3.9 x 1019 molecules of Cl2?

Question 10

How many grams of aluminum are in 0.58 moles of Al2O3·2H2O?


1. 159.5 g/mol
2. 69.09 g/mol
3. 729.8 g/mol
4. 138.47 g/mol
5. 474.2 g/mol
6. 14.4 grams
7. 0.144 moles
8. 2.35 x 1023 atoms
9. 4.6 mg of chlorine
10. 31.3 grams of aluminum