The combustion of one mole of CH3OH is: CH3OH+O2→CO+2H2O The oxidation number of carbon in CH3OH is, x+(3×1)+(1×2)+(1×1)=0 x=−2 The oxidation number of carbon in CO is, x+(1×−2)=0 x=2 The difference in oxidation number becomes 2−(−2)=4 The expression for equivalent weight of methanol is, E‌‌=‌