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Q9 Calculating the enthalpy of formation of propane from bond energy data and ∆H_sub(carbon) Don't forget to change the positive signs for bond enthalpies of dissociation into negative values of bond formation.
3C_(s) + 4H_2(g) C₃H_8(g)
ΔH^Ø_sub_{(C_(s))} + 4 x ΔH^Ø_bond_{diss(H_2(g))} = (3 x 715) + (4 x 436) = 2145 + 1744 = +3889 kJ			2 x ΔH^Ø_{bond form}_{(_C-C(g))} + 8 x ΔH^Ø_{bond form}_{(_C-H(g))} (2 x -348) + (8 x -412) = = -696 - 3296 = -3992 kJ
3C_(g) + 8H_(g)
∆H_{form(C₃H₈)} = +3889 + (-3992) = -103 kJ mol^-1 (data book value -104 kJ mol^-1)

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