The reaction in which $\Delta H > \Delta U$ is

Question

$CaCO_3(s) \rightarrow CaO(s) + CO_2(g)$

$N_2(g) + O_2(g) \rightarrow 2NO(g)$

$CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l)$

$N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$

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