You find a little bit (0. 150g) of a chemical marked tri-nitro-toluene, and upon combusting it in oxygen, collect 0. 204 g of co2 and 0. 030 g h2o (we’ll assume that these are the products, along with nitrogen). You know that tnt is made up solely of c, h, o, and n, and that it contains 18. 5% nitrogen by mass.