When nitrogen dioxide (NO2) from car exhaust combines with water in the air, it forms nitric acid (HNO3), which causes acid rain, and nitrogen oxide; 3NO2(g)+H20(l)-->2HNO3(aq)+NO(g). a) How many molecules of NO2 are needed to react with 0.250 mol of H2O? b) How many grams of HNO3 are produced when 60.0 g of NO2 completly reacts? c) How many grams of HNO3 can be produced if 225 g of NO2 is mixed with 55.2 g of H2O