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

Calculate the molar mass of CuSO_{4}.

## Question 2

Calculate the molar mass of CaCOH.

## Question 3

Calculate the molar mass of Cr_{4}(P_{2}O_{7})_{3}.

## Question 4

Calculate the molar mass of RbOH·2H_{2}O.

## Question 5

Calculate the molar mass of KAl(SO_{4})_{2}·12H_{2}O.

## Question 6

What is the mass in grams of 0.172 moles of NaHCO_{3}?

## Question 7

How many moles of CdBr_{2} are in a 39.25 gram sample of CdBr_{2}?

## Question 8

How many atoms of cobalt are in a 0.39 mole sample of Co(C_{2}H_{3}O_{2})_{3}?

## Question 9

What is the mass in milligrams of chlorine in 3.9 x 10^{19} molecules of Cl_{2}?

## Question 10

How many grams of aluminum are in 0.58 moles of Al_{2}O_{3}·2H_{2}O?

## Answers

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 10^{23} atoms

9. 4.6 mg of chlorine

10. 31.3 grams of aluminum