Consider the reaction \[{{N}_{2}}+3{{H}_{2}}\xrightarrow{\,}2\,N{{H}_{3}}\] carried out at constant temperature and pressure. If\[\Delta H\]and\[\Delta U\]are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?
AIEEE Solved Paper-2005
A)\[\Delta H>\Delta U\]
B)\[\Delta H<\Delta U\]
C) \[\Delta H=\Delta U\]
D) \[\Delta H=0\]
Correct Answer:
B
Solution :
enthalpy change (at constant pressure) internal energy change (at constant volume) (given reaction is exothermic) mole of (gaseous products gaseous reactants) Thus, Note Numerical valuein exothermic reaction and when.