CALCULATIONS PROBLEM SOLVING (STOICHIO)

Question 1

The number of moles and the mass (in grams) of chlorine, Cl2, required to react with 10.0 g of sodium metal, Na, to produce sodium chloride, NaCl.

Answer 1

2Na+Cl2→2NaCl

0.217 mol Cl2

15.43 g Cl2

Question 2

The number of moles and the mass (in milligrams) of diatomic oxygen formed by the decomposition of 1.252 g of mercury(II) oxide.

Answer 2

2HgO→2Hg+O2

0.00289 mol O2

92 mg O2

Question 3

The number of moles and the mass (in g) of sodium nitrate, NaNO3, required to decompose and produce 128 g of diatomic oxygen, where NaNO2 is the other product.

Answer 3

2NaNO3→2NaNO3+O2

8 mol NaNO3

680 g NaNO3

Question 4

The number of moles and the mass (in kg) of carbon dioxide formed by the combustion of 20.0 kg of carbon in an excess of diatomic oxygen.

Answer 4

C+O2→CO2

1666.67 mol CO2

73.3 kg CO2

Question 5

The number of moles and the mass (in kg) of copper(II) carbonate needed to decompose in order to produce 1.500 kg of copper(II) oxide, where CO2 is the other product.

Answer 5

CuCO3→CuO+CO2

18.87 mol CuCO3

2.330 kg CuCO3

Question 6

The number of moles and mass (in grams) of C2H4 required to react with water to produce 9.55 g C2H6O.

Answer 6

C2H4+H2O→C2H6O

0.207 mol C2H4

5.81 g C2H4