According to the equation...

Question

Acrylonitrile is produced according to the following equation, 2 C3H6(g) + 2 NH3(g) + 3 O2(g) -> 2 C3H3(g) + 6 H2O(g). If 5.0L of ammonia reacts with appropriate volumes of the other reactants, what is the volume of water vapour that would be produced?

Answer 1

First, we know that the moles of a gas produced and its volume are proportional assuming that temperature and pressure are the same throughout the reaction. Additionally, we see that for every 2 moles of ammonia used, 6 moles of water are produced. Therefore the volume of water produced is 3 times the amount of ammonia used, since the ratio of water to ammonia in the reaction is 3:1. So by mulitplying 5.0L of ammonia by the ratio of (3L H₂O / 1L NH₃), we get that 15L of water are produced.