1. The problem statement, all variables and given/known data one gram of each of the following gases is introduced into a 10 L container at 25 degrees C a) propane b) ethane c) methane d) pentane which gas will consume the greatest mass of oxygen upon complete combustion? The solutions says that the right answer is D. I do not know why 2. Relevant equations no equations. just chemical ones. 3. The attempt at a solution My logic is that if I have greater number of moles of hydrocarbon, I will need more oxygen to consume. I thus thought that since methane has a lesser molar mass, we have greater moles, so we will need greater moles [which leads to a higher mass] of O2 gas needed. Could anyone please advise on how to solve this? Thanks!