Stoichiometry 1 1. Ammonia gas reacts with oxygen gas according to the following equation: 4 NH3 5 024NO 6 H20 How many moles of oxygen gas are needed to react with 23 moles of ammonia? (29 mole) b. How many grams of NO are produced when 25 moles of oxygen gas react with an excess of ammonia? (600 g)