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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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Similar questions

Q. 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)

Q. Standard heats of formation for

C {C l}_{4}, H_{2} O, {C O}_{2}

H C l

298 K

- 25.5, - 57.8, - 94.1

- 22.1 k J / m o l

respectively.
For the reaction, what will be

Δ H

?

C {C l}_{4} + 2 H_{2} O \to {C O}_{2} + 4 H C l

Q. The standard heats of formation at

298 K

C {C l}_{4} (g), H_{2} O (g), {C O}_{2} (g)

H C l (g)

- 25.5, - 57.8, - 94.1

- 22.1

k c a l

{m o l}^{- 1}

respectively. Calculate

Δ H_{298}^{o}

for the reaction.

C {C l}_{4} (g) + H_{2} O (g) ⟶ {C O}_{2} (g) + 4 H C l (g)

Q. 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)

Q. The standard heat of formation at

298 K

C {C l}_{4} (g), H_{2} O (g), {C O}_{2} (g), H C l (g)

- 25.5, - 57.8, - 94, 1, - 22.1

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

respectively, calculate

Δ H_{298}^{o}

for the reaction,

C {C l}_{4} (g) + 2 H_{2} O (g) ⟶ {C O}_{2} (g) + 4 H C l (g)

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Heat of Formation

Standard XII Chemistry

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