Which of the reactions defines \( \Delta_{f} H^{0} \) ? (A) \( \mathrm{C}_{\text {(diamond) }}+\...
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0Which of the reactions defines \( \Delta_{f} H^{0} \) ?
(A) \( \mathrm{C}_{\text {(diamond) }}+\mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g) \)
(B) \( \frac{1}{2} \mathrm{H}_{2}(g)+\frac{1}{2} \mathrm{~F}_{2}(g) \longrightarrow \mathrm{HF}(g) \)
(C) \( \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g) \longrightarrow 2 \mathrm{NH}_{3}(g) \)
(D) \( \mathrm{CO}(g)+\frac{1}{2} \mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g) \)
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