When one mole of $NH_3$ gas and one mole of $HCl$ gas are mixed in a closed container to form ammonium chloride gas,which of the following is true?
- A$\Delta H < \Delta U$
- B$\Delta H > \Delta U$
- C$\Delta H = \Delta U$
- DThere is no relationship between $\Delta H$ and $\Delta U$.
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