# Given the equation, CH_4 + 2O_2->2H_2O + CO_2, what is the total number of moles of oxygen that must react to produce 5 moles of carbon dioxide?

You must observe the stoichiometry of the reaction. A mole of methane produces a mole of carbon dioxide. If 5 mole of carbon dioxide are specified, I need how many moles of methane in order to satisfy this stoichiometry? If 5 mole of carbon dioxide were collected, how many moles of oxygen gas (i.e. ${O}_{2}$) were necessary?