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Question

Difference between H and U for the combustion of benzene at 300 K is

A
7.48 kJ
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B
3.74 kJ
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C
14.86 kJ
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D
5.73 kJ
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Solution

The correct option is B 3.74 kJ
Combustion of benzene is represented by
C6H6(l)+152O2(g)6CO2(g)+3H2O(l)
change in no. of moles of gaseous products and reactants
Δn=nproductsnreactants
n=6152=32FromH=U+nRTHU=nRTHU=32×8.314×300=3741.3×103=3.74 kJ

The difference is asked in question so we can simply take the magnitude hence 3.74 kJ is the answer.

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