For which of the following reactions is $\Delta U = \Delta H$?
- A$N_2O_4(g) \rightleftharpoons 2NO_2(g)$
- B$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$
- C$H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$
- D$H_2(g) + 1/2 O_2(g) \rightleftharpoons H_2O(l)$
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