# How many grams of methane are produced from the complete reaction of 5.15 moles of carbon monoxide in the reaction CO + 3H_2 -> H_2O + CH_4?

1 mole of $C O$ produces 1 mole $C {H}_{4}$ when it reacts completely
So 5.15 mole $C O$ will produce 5.15 mole $C {H}_{4}$
molar mass of $C {H}_{4} = 16 g m m o {l}^{-} 1$
Mass of 1 mole $C {H}_{4} = 16 g$
So mass of 5.15 mole $C {H}_{4} = 5.15 \times 16 = 82.4 g$