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The combustion of benzene (l) gives CO(2...

The combustion of benzene (l) gives `CO_(2)(g)` and `H_(2)O(l)`. Given that heat of combustion of benzene at constant volume is `–3263.9 kJ mol^(–1)` at `25^(@)C`, heat of combustion (in kJ` mol^(–1)`) of benzene at constant pressure will be
(R = 8.314 JK–1 mol–1)

A

`- 452.46`

B

3260

C

`- 3267.6`

D

4152.6

Text Solution

Verified by Experts

The correct Answer is:
C
`C_(6)H_(6("liq"))+7.5O_(2(g))rarr6CO_(2(g))+3H_(2)O_("liq")`
`Deltan_((g))=6-7.5=-15`
`DeltaH=DeltaE+Deltan_((g))RT`
`DeltaH=-3263.9kJ-(1.5xx8.314xx298)/(1000)kJ=-3267.6 kJ`
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Knowledge Check

  • The combustion of benzene (l) gives CO_(2)(g) and H_(2)O(l) . Given that heat of combustion of benzene at constant volumeis - 3263.9 Kj mol^(-1) at 25^(@)C , heatof combustion ( in kJ mol^(-1)) of benzene at constant pressure will be ( R = 8.314 JK^(-1) mol^(-1))

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    4152.6
    B
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    `-3267.6`

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