The oxidation of ethanol CH3-H2C-OH produces acetaldehyde CH3-HC=O. This reaction catalyzed by enzymes takes place in the body after alcohol consumption. The accumulation of acetaldehyde combined with dehydration leads to what is commonly known as a hang-over. Calculate the ?Hreaction of the reverse reaction the reduction of acetaldehyde back to ethanol. CH3-HC=O(g) + H2(g) --> CH3-CH2-OH(g) Bond Bond enthalpy (kJ/mol) C=O 745 C-O 351 H-H 436 O-H 460 C-H 414 The ?Hreaction is 1.----- kJ/mol.