J.R. S. answered 07/31/22
Ph.D. University Professor with 10+ years Tutoring Experience
First, write the balanced equation for the combustion of methane (CH4)
CH4 + 2O2 ==> CO2 + 2H2O ... balanced equation
Next, convert 22 g CO2 to moles of CO2 by using 44 g / mol CO2 as the molar mass:
22 g CO2 x 1 mol CO2 / 44 g = 0.50 moles CO2
Finally, use the stoichiometry of the balanced equation to find moles of methane needed:
0.50 moles CO2 x 1 mol CH4 / 1 mol CO2 = 0.5 moles CH4 needed