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Question

The standard enthalpy of formation of octane (C8H18) is 250 kJ/mol. Calculate the enthalpy of combustion of C8H18.
Given : enthalpy of formation of CO2(g) and H2O(l) are 394 kJ/mol and 286 kJ/mol respectively:

A
5200 kJ/mol
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B
5726 kJ/mol
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C
5476 kJ/mol
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D
5310 kJ/mol
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Solution

The correct option is C 5476 kJ/mol
C8H18(g)+252O2(g)8CO2(g)+9H2O(l)ΔrH=8×(394)+9×(286)(250)=5476 kJ/mol

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