Gas Stoichiometry

• Equal volumes of gases at the same temperature and pressure contain equal amounts of particles

• The coefficients in a balanced equation are the number of moles and relative volumes

• What volume of oxygen gas is needed for the complete combustion of 4.00 L of propane gas (C3H8)?

1. Write balanced equation

2. Use balanced equation for volume ratio

3. Solve

• N2 + H2 NH3

• If 5.0 L of nitrogen reacts completely by this reaction at a constant pressure of 3.00 atm and temperature of 298 K, how many grams of ammonia are produced?

1. Balance equation to get volume ratios

2. Determine how many liters of ammonia will form

3. Use IGL to solve for number of moles

4. Convert moles to mass

Using IDL for Density• D =• How can we rearrange the IGL to solve for density?