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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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