Combustion of 0.1136g of an explosive sample yields 0.1540g CO_2, 0.0225g H_2O, and a small amount of nitrogen. You react the nitrogen with H_2 gas to produce 0.0256g NH_3. You know that this explosive also contains oxygen atoms.
1) What is the empirical formula for this compound?
2) An old piece of label says, "227.1 u" Using this information, find the molecular formula.