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