Enthalpy of combustion of methanol, graphite and hydrogen are- 726kj/mol, -394 kj/mol and -286 kj/mol respectively. Calculate the enthalpy of formation of methanol.
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ΔH
f
0
(methanol) = -1.5 KJ/mol
ΔH
f
0
(octane) = -10.9 KJ/mol
Heat of combustion α + Heat of formation.
∴ΔH (octane) is more negative than ΔH (methanol).
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