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))`

Explanation

To calculate the heat of combustion of benzene at constant pressure at \(27^\circ C\), we will follow these steps:

### Step 1: Calculate the number of moles of benzene
The molecular weight of benzene (\(C_6H_6\)) is \(78 \, g/mol\). Given that we have \(7.8 \, g\) of benzene, we can calculate the number of moles (\(n\)) using the formula:

\[ n = \frac{\text{mass}}{\text{molar mass}} = \frac{7.8 \, g}{78 \, g/mol} = 0.1 \, mol \]
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