A) \[\Delta H<\Delta E\], only if the number of moles of gaseous products is greater than the number of moles of gaseous reactants
B) \[\Delta H<\Delta E\], only if the number of moles of gaseous products is less than the number of moles of gaseous reactants
C) \[\Delta H\] is always greater than \[\Delta E\]
D) \[\Delta H\] is always less than \[\Delta E\]
Correct Answer: B
Solution :
\[\Delta H=\Delta E+\Delta nRT\] \[\Delta n\] = number of moles of gaseous products \[({{n}_{p}})\] number of moles of gaseous reactants \[({{n}_{R}})\] If \[{{n}_{P}}<{{n}_{R}}\] \[\Delta n=-ve\] \[\therefore \] \[\Delta H<\Delta E\]
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