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Question

Difference between H and U for the combustion of benzene at 300 K is :
C6H6(l)+152O2(g)6CO2(g)+3H2O(l)

A
10.48 kJ
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B
3.74 kJ
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C
14.86 kJ
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D
6.73 kJ
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Solution

The correct option is B 3.74 kJ
Combustion of benzene is represented by following reaction;
C6H6(l)+152O2(g)6CO2(g)+3H2O(l)

The difference in gaseous moles of product and reactant is :
ng=6152=3/2
And we have relation,
H=U+ngRT
so,
HU=ngRT
HU=32×8.314×300
=3741.3 J=3.741 kJ

Hence the difference between H and U for the combustion of liquid benzene is 3.74 kJ.

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