The balanced chemical reaction would be as follows:
CH4 + O2 = CO2 + 2H2O
We are given the amount of CO2 product in the reaction. This will be the starting point for the calculations. We do as follows:
5.6 L CO2 ( 1 mol / 22.4L ) ( 1 mol CH4 / 1 mol CO2 ) ( 16.05 g / 1 mol ) = 4.01 g CH4 needed
