One reaction step in the conversion of ammonia to nitric acid involves converting NH3 to NO by the following reaction:
4 NH3(g) + 5 O2(g) --> 4 NO(g) + 6 H2O(g)

If 1.50 g of NH3 reacts with 2.75 g O2, then:
1. Which is the limiting reactant?
2. How many grams of NO and H2O form?
3. How many grams of the excess reactant remain after the limiting reactant is completely consumed?