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Tabeed Dasgupta
Asked: 2022-11-06T09:24:57+05:30 In:

Consider the reaction at `300K`
`C_(6)H_(6)(l)+(15)/(2)O_(2)(g)rarr 6CO_(2)(g)+3H_(2)O(l),DeltaH=-3271`kJ
What is `DeltaU` for the combustion of `1.5` mole of benzene at `27^(@)C` ?
A. `-3267.25kJ`
B. `-4900.88kJ`
C. `-4906.5kJ`
D. `-3274.75kJ`

Consider the reaction at `300K`
`C_(6)H_(6)(l)+(15)/(2)O_(2)(g)rarr 6CO_(2)(g)+3H_(2)O(l),DeltaH=-3271`kJ
What is `DeltaU` for the combustion of `1.5` mole of benzene at `27^(@)C` ?
A. `-3267.25kJ`
B. `-4900.88kJ`
C. `-4906.5kJ`
D. `-3274.75kJ`
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1 Answer

  1. Correct Answer – 2
    For 1 mole of combustion of benzene
    `Deltan=-1.5`
    `DeltaH^(@)=DeltaU+Deltan_(9)RT`
    `rArr-3271=DeltaU-(1.5xx8.314xx300)/(1000)`
    `rArr” “DeltaU=-3267.25xx1.5=-4900.88kJ`

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