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For which one of the following equations is \( \Delta H^{\circ} \) reaction equal to \( \Delta H^{\circ}{ }_{f} \) for the product?
(a) \( \mathrm{N}_{2(g)}+\mathrm{O}_{3(g)} \rightarrow \mathrm{N}_{2} \mathrm{O}_{3(g)} \)
\( \mathrm{P} \)
(b) \( \mathrm{CH}_{4(g)}+2 \mathrm{Cl}_{2(g)} \rightarrow \mathrm{CH}_{2} \mathrm{Cl}_{2(l)}+2 \mathrm{HCl}_{(g)} \)
(c) \( \mathrm{Xe}_{(g)}+2 \mathrm{~F}_{2(g)} \rightarrow \mathrm{XeF}_{4(g)} \)
(d) \( 2 \mathrm{CO}_{(g)}+\mathrm{O}_{2(g)} \rightarrow 2 \mathrm{CO}_{2(g)} \)
(2003)
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