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From the following data at \( 25^{\circ} \mathrm{C} \), which of the following statement(s) is/are correct?
\( 1 / 2 \mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{OH}(\mathrm{g}): \Delta H^{\mathrm{o}}=42 \mathrm{~kJ} \)
\( \mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g}): \Delta H^{\mathrm{o}}=-242 \mathrm{~kJ} \)
\( \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g}): \Delta H^{\mathrm{o}}=436 \mathrm{~kJ} \)
\( \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{O}(\mathrm{g}): \Delta H^{\mathrm{o}}=495 \mathrm{~kJ} \)
(a) \( \Delta_{\mathrm{r}} H^{\mathrm{o}} \) for the reaction \( \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow 2 \mathrm{H}(\mathrm{g})+\mathrm{O}(\mathrm{g}) \) is \( 925.5 \mathrm{~kJ} \).
(b) \( \Delta_{\mathrm{r}} H^{\mathrm{o}} \) for the reaction \( \mathrm{OH}(\mathrm{g}) \rightarrow \mathrm{H}(\mathrm{g})+\mathrm{O}(\mathrm{g}) \) is \( 502 \mathrm{~kJ} \).
(c) Enthalpy of formation of \( \mathrm{H}(\mathrm{g}) \) is \( -218 \mathrm{~kJ} / \mathrm{mol} \).
(d) Enthalpy of formation of \( \mathrm{OH} \) (g) is \( 42 \mathrm{~kJ} / \mathrm{mol} \).
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