Using the data provided, calculate the multiple bond energy (kJ mol-1) of a C ≡ C bond in C2H2.Given that the heat of formation of C2H2 = 225 kJ mol-1.(take the bond energy of a C - H bond as 350 kJ mol-1)

i) 2C(s)+H2(g)⟶H−C≡C−H(g)                    ΔH=225kJmol−1ii) 2C(s)⟶2C(g)                                          ΔH=1410kJmol−1iii)  (iii) H2(g)⟶2H(g)                          ΔH=330kJmol−1 From equation (i):225=[1410+1×330]−2×350+1×eC≡C225=[1410+330]−700+eC≡C225=1740−700−eC≡CEC≡C=1040−225=815kJmol−1BEC≡C=815kJmol−1