posted by Bryan .
When 16 grams of methane gas combine with 64 grams of oxygen, 44 grams of carbon dioxide form, plus water. What mass of water is produced?
You can work this problem as a stoichiometry problem OR you can recognize that the law of conservation of mass tells us that the mass on one side must equal to that of the other. First, make sure that all of the CH4 and all of the O2 are used.