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As per your syllabus, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond — is the reference state of carbon)?
A−393.5 kJ/mol
B+1.89 kJ/mol
C+393.5 kJ/mol
D0 kJ/mol
Answer & Solution
Correct answer: B. +1.89 kJ/mol
As per your syllabus, C(graphite) = 0 (reference).
C(diamond) = +1.89 kJ/mol — slightly less stable than graphite.
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