Chemistry – Materials & Resources Mole Quiz Review

Complete these practice problems for the quiz. The answers are on the next page. Remember that you must

use dimensional analysis to solve the mole problems! Most of the points come from showing your work.

1. Identify the type of representative particle found in each sample, and then calculate the molar mass of the

sample.

a. silver carbonate e. oxygen gas

b. NH4OH f. helium gas

c. C8H18 g. sodium oxide

d. zinc metal h. P4O10

2. Complete these unit conversions.

a. How many atoms are in 2.0 moles of calcium metal?

b. What is the mass (in grams) of 3.0 moles of arsenic? c. How many moles of N2 gas are in 4.0 x 1019 molecules of N2 gas? d. How many atoms are in a 14.5 gram sample of neon gas?

You should be able to:

Choose the correct particle term for a chemical – atom, molecule, or formula unit.

Use the periodic table to calculate molar masses.

Use dimensional analysis to convert between units of particles, moles and grams.

ANSWERS

1. Identify the type of representative particle found in each sample, and then calculate the molar mass of the

sample.

a. Ag2CO3 , f.u., 275.8 g/mol e. O2 , molecule, 32.0 g/mol

b. f.u. (combination of 2 polyatomic ions), 35.0 g/mol f. He ,atom, 4.0 g/mol

c. molecule, 114 g/mol g. Na2O , f.u., 62.0 g/mol

d. Zn ,atom, 65.4 g/mol h. molecule, 284.0 g/mol

2. Complete these unit conversions.

a. How many atoms are in 2.0 moles of calcium metal?

b. What is the mass (in grams) of 3.0 moles of arsenic?

c. How many moles of N2 gas are in 4.0 x 1019 molecules of N2 gas?

d. How many atoms are in a 14.5 gram sample of neon gas?