Which of the reaction defines molar \( \Delta \mathrm{H}_{\mathrm{f}}^{\circ} \) ?....

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Which of the reaction defines molar \( \Delta \mathrm{H}_{\mathrm{f}}^{\circ} \) ?
\( \mathrm{P} \)
(1) \( \mathrm{CaO} \) (s) \( +\mathrm{CO}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CaCO}_{3}(\mathrm{~s}) \)
W
(2) \( \mathrm{Br}_{2}(l)+\mathrm{H}_{2}(\mathrm{~g}) \longrightarrow \mathrm{HBr}(\mathrm{g}) \)
(3) \( \mathrm{N}_{2}(\mathrm{~g})+2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{NH}_{4} \mathrm{NO}_{3}(\mathrm{~s}) \)
(4) \( \mathrm{I}_{2}(\mathrm{~s})+\mathrm{H}_{2}(\mathrm{~g}) \longrightarrow \mathrm{HI}(\mathrm{g}) \)


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