If $\Delta H$ is the change in enthalpy,$\Delta U$ is the change in internal energy,$N_P$ is the number of moles of products,and $N_r$ is the number of moles of reactants,then which of the following is correct for a gaseous reaction?
- A$\Delta H > \Delta U$ always
- B$\Delta H < \Delta U$ when $N_P > N_r$
- C$\Delta H < \Delta U$ when $N_P < N_r$
- D$\Delta H > \Delta U$ when $N_P > N_r$
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