Hydrogenation of carbon double bonds C=C (i.e. adding a hydrogen on each carbon atom and thus reducing the double bond into a single bond: H-C-C-H) is a very common process in organic and polymer chemistry. Using the data from the following table, calculate the ?Hreaction when ethylene C2H4 is reduced into ethane according to the reaction below: C2H4(g) + H2(g) --> C2H6(g) Bond Bond enthalpy (kJ/mol) C=C 620 C-C 347 H-H 436 C-H 414 The ?Hreaction is 1.----- kJ/mol