Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor?

For number 1: Find the moles of NH3 and O2 and use the mole ratios to determine which one is the limiting reactant. From there, you should be able to find the theoretical yield. For number 2: First write the formulas for hydrochloric acid and calcium hydroxide and write a balanced chemical equation. From there you should be able to identify the salt that is produced.