The heat of formation of CO₂(g), H₂O(l) and C3H4(g) are x, y and z kJ/mol respectively. What will be the heat of combustion (in kJ/mol) of C3H4(g)?
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The enthalpy change for the reaction is the difference between the total enthalpy of products and the total enthalpy of reactants.
ΔH
r
=[3(ΔH
f
)
CO
2
+4(ΔH
f
)
H
2
O
−(ΔH
f
)
C
3
H
8
]
−2221.6=3×(−394)−4(285.8)−(ΔH
f
)
C
3
H
8
(ΔH
f
)
C
3
H
8
=−103.6kJ/mol
Hence, the heat of formation of C
3
H
8
(g) is −103.6kJ/mol.
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