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…

The combustion of benzene (l) gives $\displaystyle \mathrm{CO}_2(\mathrm{~g})$ and $\displaystyle \mathrm{H}_2 \mathrm{O}(\mathrm{l})$. Given that heat of combustion of benzene at constant volume is $\displaystyle -3263.9 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at $\displaystyle 25$° C; heat of combustion (in $\displaystyle \mathrm{kJ} \mathrm{mol}^{-1}$ ) of benzene at constant pressure will be : $$\left(\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right) $$