gas stoich assignment

Question

2C2H2+5O2=4CO2+2H2O If you have 62.3 grams of oxygen, how many liters of water could be produced?

2CO+O2=2CO2 If you have 9.32 liters of O2 how many grams of CO2 could be produced?

2CO+O2=2CO2 If you have 15,0 grams of CO how many liters of CO2 could be produced ?

Answer 1

The following answers are based on the assumption of STP (standard temperature and pressure)

2C2H2 + 5O2 => 4CO2 + 2H2O

molar mass O2 = 32 g / mol

62.3 g O2 x 1 mol O2 / 32 g = 1.95 mols O2

1.95 mols O2 x 2 mols H2O / 5 mols O2 = 0.779 mols H2O

At STP, 1 mol of an ideal gas = 22.4 L

0.779 mols H2O x 22.4 L / mol = 17.4 Liters of water produced

2CO + O2 => 2CO2

molar mass CO2 = 44 g / mol

9.32 L O2 x 2 L CO2 / 1 L O2 = 18.64 L CO2

At STP: 18.64 L CO2 x 1 mol CO2 / 22.4 L = 0.832 mols CO2

0.832 mols CO2 x 44 g / mol = 36.6 g CO2

molar mass CO = 28 g / mol

15.0 g CO x 1 mol CO / 28 g = 0.536 mols CO

0.536 mol CO x 2 mol CO2 / 2 mol CO = 0.536 mols CO2

At STP: 0.536 mols CO2 x 22.4 L / mol = 12.0 L CO2