A) \[\Delta H>\Delta U\]
B) \[\Delta H=\Delta U\]
C) \[\Delta H<\Delta U\]
D) there is no relationship
Correct Answer: C
Solution :
\[\underset{1\,mol}{\mathop{N{{H}_{3}}(g)}}\,+\underset{1\,mol}{\mathop{HCl(g)}}\,\xrightarrow{{}}\underset{1mol}{\mathop{N{{H}_{4}}Cl(g)}}\,\] \[\Delta H=\Delta U+{{n}_{g}}RT\] \[{{n}_{g}}=\] Number of moles of product - number of moles of reactant \[=1-2=-1\] \[\Delta H=\Delta U-RT\] \[\therefore \] \[\Delta H<\Delta U\]
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