Chemical Thermodynamics Question 129

Question: $ \Delta E^{o} $ of combustion of isobutylene is $ -X,kJ,mo{{l}^{-1}} $ . The value of $ \Delta H^{o} $ is [DCE 2004]

Options:

A) $ =\Delta E^{o} $

B) $ >\Delta E^{o} $

C) $ =0 $

D) $ <\Delta E^{o} $

Show Answer

Answer:

Correct Answer: D

Solution:

$ {{(CH_3)}_2}C=CH_2(g)+6O_2(g)\to 4CO_2(g)+4H_2O(l) $

$ \Delta ng=4-6=-2 $ (i.e., negative) we know that $ \Delta H=\Delta E+\Delta ngRT $

$ =\Delta E-(\Delta ng)RT $ ( $ \because ,\Delta ng=-ve) $

$ \therefore \Delta H<\Delta E $



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