Gas Stoichiometry 2C 4 H 10 (g) + 13O 2 (g) 8CO 2 (g) + 10H 2 O(g) What type of reaction is this? How many moles of butane gas react with how many moles of oxygen gas?
Gas Stoichiometry 2C 4 H 10 (g) + 13O 2 (g) 8CO 2 (g) + 10H 2 O(g) Avogadros Principle: = V of gas at same T & P contain = # of particles Coefficients represent not only molar amounts, but also relative volumes
Gas Stoichiometry- Volume Only CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O (g) It takes 2 L of O 2 to react completely with 1 L of CH 4 The complete combustion of 1 L of methane produces 1 L of carbon dioxide and 2 L of water vapor. What volume of methane is needed to produced 26 L of water vapor?
Gas Stoichiometry- Volume Only What volume of oxygen gas is needed for the complete combustion of 4 L of propane gas? Assume constant pressure and temperature. C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O(g) 20.0 L O 2
Gas Stoichiometry- Volume & Mass Balanced chemical equations allow you to find ratios for moles and volume – not for masses!
Gas Stoichiometry- Volume & Mass N 2 (g) + 3H 2 (g) 2NH 3 (g) If 5.00 L of nitrogen reacts completely by this reaction at a constant pressure and temperature of 3.00 atm and 298 K, how many grams of ammonia are produced? Givens: V N2 = 5.00 L P = 3.00 atm T = 298 K Unknown: m NH3 = ?
N 2 (g) + 3H 2 (g) 2NH 3 (g) Find V NH3. Rearrange Ideal Gas Law equation to solve for n. Convert moles of ammonia to grams.
N 2 (g) +3H 2 (g) 2NH 3 (g) What volume of nitrogen at STP would be required to react with 0.100 mol of hydrogen to produce ammonia?
4Fe(s) + 3O 2 (g) 2Fe 2 O 3 (s) Calculate the volume of oxygen gas at STP that is required to completely react with 52.0 g of iron. Givens: m Fe = 52.0 g T = 273 K P = 1 atm Unknown: V O2 = ? Convert Fe mass to moles. Determine number of moles of O 2. Determine volume of O 2 using Ideal Gas Law. 15.6 L