Which of the following defines the heat of formation of Cr2O3 (s) ?
A) 2 Cr (s) + 3 O (g) → Cr2O3 (s)
B) 2 Cr (s) + 3/2 O2 (g) → Cr2O3 (s)
C) 4 Cr (s) + 3 O2 (g) → 2 Cr2O3 (s)
D) Cr2 (s) + 3/2 O2 (g) → Cr2O3 (s)
E) none of these
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