Use the data to find another value for the enthalpy of buta-l , 3 —diene. Bond energies Enthalpies of atomisation C-H 413 KJ/mol C 715 KJ/mol 346 KJ/mol H 218 KJ/mol 610 KJ/mol

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∆Hf = {Σ ∆H to turn elements into gaseous atoms -Σ ∆H to turn compound into gaseous atoms}

4C(s) + 3H2(g) =CH2CHCHCH2(g)

∆ Hf = {4x∆Hat [C] + 3 x E[H-H]) – (E[C-C] + 6 x E[C-H] +2×E(C=C)}

{4 x715+3 x2 x218-(413 x6 +2 x610 x346)} kJ/mol

∆ Hf=+124kJ/mol

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