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Which one of the following has \( \Delta \mathrm{S}^{0} \) greater than zero?
(a) \( \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CaCO}_{3}(\mathrm{~s}) \)
(b) \( \mathrm{NaCl}(\mathrm{aq}) \rightleftharpoons \mathrm{NaCl}(\mathrm{s}) \)
(c) \( \mathrm{NaNO}_{3} \) (s) \( \rightleftharpoons \mathrm{Na}^{+} \)(aq) \( +\mathrm{NO}_{3}^{-} \)(aq)
(d) \( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \)
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