1. 1. How many grams are in 0.32 moles of lead (II) chloride?
0.32 mole PbCl2 x g = 89 grams PbCl2
1 mole

2. How many moles are in a 152 gram sample of aluminum carbonate?
152 g Al2(CO3)3 x 1 mole = moles
234.0g

3. What is the percentage (by mass) of
oxygen in zinc nitrate?
Zn (NO3)2
Zn = 65.4
2 N = 28.0
6 O = x 100 = 50.7 %
oxygen

4. 4. How many moles in 49.3 grams of
carbon tetrachloride?
49.3 g CCl4 x 1 mole = moles CCl4
154.0 g

5. What is the mass of 0.15 moles of
potassium sulfate?
0.15 mole K2SO4 x g = 26. g K2SO4
1 mole

6. 6. What is the percentage of sulfur in
chromium(III) sulfate?
Cr2(SO4)3
2 Cr = 104.0
3 S = = % S
12 O =
392.3

7. How many grams in 1.3 moles of sugar
(C6H12O6)?
1.3 mole C6H12O6 x g = 230 g
1 mole

8. How many atoms are in 2.5 moles of
mercury?
2.5 mol x x 1023 atoms = 1.5 x 1024 atoms
1 mole

9. 9. How many atoms are in 6.0 g of carbon?
6.0g C 1 mol C = 0.50 mol C
12.0 g C
0.50 mol x 1023atoms = 3.0 x 1023 atoms
1 mol