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Heat Capacity at Constant Pressure

The heat of r...

Question

The heat of reaction for $C_{10} H_{8} (s) + 12 O_{2} (g) \to 10 C O_{2} (g) + 4 H_{2} O (l)$ at constant volume is $- 1229.892$ Kcal at $25^{o}$ C. Calculate the heat of reaction at constant pressure at $25^{o}$ C.

- 1992.367

Kcal

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- 1231.084

Kcal

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- 5671.315

Kcal

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- 2234.567

Kcal

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Solution

The correct option is D $- 2234.567$ Kcal
Heat of reaction at constant pressure is $H$
$Δ H = Δ E + n_{g} R T$
$Δ H = - 1229.892 - 2 \times 2 \times 298 = - 2234.567$

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25^{o} C .

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