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The heat liberated on complete combustio...

The heat liberated on complete combustion of `7.8g` benzene is `327kJ`. This heat has been measured at constant volume and at `27^(@)C`. Calculate heat of combustion of benzene at constant pressure at `27^(@)C`. `(R=8.3 J mol^(-1)K^(-1))`

Text Solution

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`C_(6)H_(6(l))+(15)/(2)O_(2(g))rarr 6CO_(2(g))+3H_(2)O_((l))`
`:. Deltan=6-(15)/(2)=-(3)/(2)`
Also, `DeltaU per mol=-(327xx78)/(7.8)=-3270kJ`
Now, `DeltaH=DeltaU+DeltanRT` ,brgt `=-3270+(-(3)/(2))xx8.3xx300xx10^(3)`
`implies DeltaH=-3273.735kJ`
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Knowledge Check

  • If the heat of combustion of carbon monoxide at constant volume and at 17^(@)C is - 283.3 kJ , then its heat of combustion at constant pressure (R=8.314 J degree ^(-1) mol^(-1)

    A
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    B
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    C
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    D
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