Which of the following reaction defines \( \Delta \mathrm{H}_{f} \) ? (A) \( \mathrm{C}_{\text {...

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Which of the following reaction defines \( \Delta \mathrm{H}_{f} \) ?
(A) \( \mathrm{C}_{\text {(diamond) }}+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g}) \)
(B) \( \frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{~F}_{2}(\mathrm{~g}) \longrightarrow \mathrm{HF}(\mathrm{g}) \)
\( P \)
W
(C) \( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{~g}) \)
(D) \( \mathrm{CO}(\mathrm{g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g}) \)
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