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Lattice Energy

The combustio...

Question

The combustion of benzene $(I)$ gives $C O_{2} (g)$ and $H_{2} O (I)$ .Given that heat of combustion of benzene at,constant volume is $- 3263.9 k J m o l^{- 1}$ at $25^{o} C$ ; heat of combustion (in $k J m o l^{- 1})$ of benzene at constant pressure will be:

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Solution

Formula,

$Δ H = Δ U + Δ n_{g} R T$

$= - 3263.8 + (6 - 7.5) \times 8.314 \times 10^{- 3} \times 298$

$= - 3267.6 k J$

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