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