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Catalysis

At 473 K, equ...

Question

At 473 K, equilibrium constant K_cfor decomposition of phosphorus pentachloride, PCl₅ is 8.3 ×10^-3. If decomposition is depicted as,

_rH° = 124.0 kJmol^–1

a) Write an expression for K_cfor the reaction.

b) What is the value of K_cfor the reverse reaction at the same temperature?

c) What would be the effect on K_c if (i) more PCl₅ is added (ii) pressure is increased? (iii) The temperature is increased?

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Solution

(a)

(b) Value of K_cfor the reverse reaction at the same temperature is:

(c) (i) K_cwould remain the same because in this case, the temperature remains the same.

(ii) K_cis constant at constant temperature. Thus, in this case, K_cwould not change.

(iii) In an endothermic reaction, the value of K_cincreases with an increase in temperature. Since the given reaction in an endothermic reaction, the value of K_cwill increase if the temperature is increased.

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Similar questions

At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, $P C l_{5} i s 8.3 \times 10^{- 3}$ . If decomposition is depicted as,
$P C l_{5} (g) \leftrightarrow P C l_{3} (g) + C l_{2} (g) Δ_{r} H^{\circ} = 124.0 k J m o l^{- 1}$

Write an expression for $K_{c}$ for the reaction.

What is the value of $K_{c}$ for the reverse reaction at the same termperature?

What would be the effect on $K_{c}$ if
(i) more $P C l_{5}$ is added
(ii) pressure is increased?
(iii) The temperature is increased?

Q. At 473 K, equilibrium constant

K_{c}

for decomposition of phosphorus pentachloride,

{P C l}_{5}

8.3 \times 10^{- 3}

. If decomposition is depicted as,

{P C l}_{5} (g) ⇌ {P C l}_{3} (g) + {C l}_{2} (g)

Δ_{r} H^{⊖} = 124.0 k J {m o l}^{- 1}

(a) Write an expression for

K_{c}

for the reaction.
(b) What is the value of

K_{c}

for the reverse reaction at the same temperature?
(c) What would be the effect on

K_{c}

{P C l}_{5}

is added (ii) pressure is increased (iii) the temperature is increased ?

473

K, equilibrium constant,

K_{c}

for decomposition of phosphorus pentachloride,

P C l_{5}

8.3 \times 10^{- 3}

. If decomposition is depicted as:

P C l_{5 (g)} ⇌ P C l_{3 (g)} + C l_{2 (g)}; △_{r} H^{0} = 124.0 k m o l^{- 1}

what would be the effect on reaction if the temperature is increased?

473 K, K_{c}

for the reaction

P C l_{5 (g)} ⇌ P C l_{3 (g)} + C l_{2 (g)} i s 8.3 \times 10^{- 3}

. What will be the value of

K_{c}

for the formation of

P C l_{5}

at the same temperature?

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g),

write the expression of

K_{c} .

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