# How many moles of oxygen will be needed to completely oxidize 4 moles of CH_4 + O_2 -> CO_2 + H_2O?

$4 C {H}_{4} \left(g\right) + 8 {O}_{2} \left(g\right) \rightarrow 4 C {O}_{2} \left(g\right) + 8 {H}_{2} O \left(l\right)$