Calculate the enthalpy of the following reaction, hc=ch, (g) + h, (g) ch, -ch,(g) the bond energies of c-h, c-c, c=c and h-h are 99, 83, 147 and 104 k cal respe

Calculate the enthalpy of the following reaction, HC=CH, (g) + H, (g) CH, -CH,(g) The bond energies of C-H, C-C, C=C and H-H are 99, 83, 147 and 104 k cal respectively The reaction is