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Benzene burns with ΔcH = -3267 kJ/mol; ΔfH of CO2 is -393.5 and H2O(l) is -285.83. Find ΔfH of benzene.

A-48.5 kJ/mol
B-6485 kJ/mol
C+48.5 kJ/mol
D+6485 kJ/mol
Answer & Solution
Correct answer: C. +48.5 kJ/mol
ΔfH = 6(-393.5) + 3(-285.83) + 3267 = -3218.5 + 3267, giving +48.5 kJ/mol.
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