Section 11.3: Stoichiometry of Gases

• Apply Gay-Lussac and Avogadro’s discoveries to the stoichiometry of reactions involving gases…

For gaseous reactants or products, the coefficients in chemical equations

reveal volume ratios (like mole ratios)

Volume-Volume Calculations• Example:

C3H8 + 5 O2 3 CO2 + 4 H2OIf the volume of propane combusted is 0.350 L….

What is the volume of CO2 produced?

Volume-Volume Calculations• Example:

C3H8 + 5 O2 3 CO2 + 4 H2OIf the volume of propane combusted is 0.350 L….

What is the volume of CO2 produced?

Volume-Volume Calculations• Example:

C3H8 + 5 O2 3 CO2 + 4 H2OIf the volume of propane combusted is 0.350 L….

What is the volume of O2 required?

Volume-Mass CalculationsExample:

CaCO3 CaO + CO2

How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide

gas at STP?

Volume-Mass CalculationsExample:

CaCO3 CaO + CO2

How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide

gas at STP?

Volume-Mass CalculationsExample:

CaCO3 CaO + CO2

How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide

gas at STP?

Volume-Mass CalculationsExample:

CaCO3 CaO + CO2

How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide

gas at STP?

Mass-Volume CalculationsExample:

WO3 + 3 H2 W + 3 H2O

How many liters of hydrogen gas at 35˚C and 0.980 atm are needed to react completely with 875 g of tungsten

oxide?

Mass-Volume CalculationsExample:

WO3 + 3 H2 W + 3 H2O

How many liters of hydrogen gas at 35˚C and 0.980 atm are needed to react completely with 875 g of tungsten

oxide?

Mass-Volume CalculationsExample:

WO3 + 3 H2 W + 3 H2O

How many liters of hydrogen gas at 35˚C and 0.980 atm are needed to react completely with 875 g of tungsten

oxide?