Under certain circumstances, carbon dioxide, CO2(g), can be made to react with hydrogen gas, H2(g), to produce methane, CH4(g), and water vapor, H2O(g):CO2(g)+4H2(g)→CH4(g)+2H2O(g)
Question: How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 88.1 moles of water vapor?