First, write a balanced chemical equation of the reaction:
C2H5OH + 3 O2 → 2 CO2 + 3H2O
3moles : 2 moles
Using n = massMolarmass, 632 : x mole
0.1875 mole : x mole
By simple proportion, X = 0.1875X23
X = 0.125 mole
