Consider the reaction: C₂H₅OH(l) O₂(g) → 2 CO₂(g) 3 H₂O(g) ΔH = −1.37x10³ kJ/mol reaction When a 21.1 g sample of ethyl alcohol, C₂H₅OH, is burned, what is the change in enthalpy? The molar mass of ethanol is 46.07 g/mol.