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Heat of Formation

The standard ...

Question

The standard heats of formation of $C C l_{4} (g), H_{2} O (g), C O_{2} (g) a n d H C l (g) a t 298 K a r e - 25.5, - 57.8, - 94.1 a n d - 22.1 k c a l m o l^{- 1} r e s p e c t i v e l y . Δ H^{0} (298 K) f o r t h e r e a c t i o n$ $C C l_{4} (g) + 2 H_{2} O (g) \to C O_{2} (g) + 4 H C l (g)$

A

+ 82.8 k c a l m o l^{- 1}

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B

- 82.8 k c a l m o l^{- 1}

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C

+ 41.4 k c a l m o l^{- 1}

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D

- 41.4 k c a l m o l^{- 1}

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Solution

The correct option is D $- 41.4 k c a l m o l^{- 1}$
We are given the standard heat of formation of reactant and products.
we know that,
$Δ H_{r}^{0} = \sum Δ_{f} H^{0} (p r o d u c t s) - \sum Δ_{f} H^{0} (r e a c t a n t s)$

putting all the values,
$= - 94.1 + 4 (- 22.1) - (- 25.5 - 2 \times 57.8) k c a l m o l^{- 1} = - 41.4 k c a l m o l^{- 1}$

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Heat of Formation

Standard XI Chemistry

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