Nitric acid can be prepared from ammonia by the following steps;
4nh3 + 5o2 = 6h2o + 4no
2no + O2 = 2no2
2no2 + h2o = hno3 + hno2
3hno2 = hno3 + 2no + h2o
If all the steps take place consecutively, completely and without recycling, what mass of ammonia is needed to give 6.3g of nitric acid.