At 473 K, equilibrium constant Kc for decomposition of phosphorus pent

1.	At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCl5is8.3×10−3. If decomposition is depicted as, PCl5(g)↔PCl3(g)+Cl2(g) ΔrH∘=124.0kJmol−1 Write an expression for Kc for the reaction. What is the value of Kc for the reverse reaction at the same termperature? What would be the effect on Kc if (i) more PCl5 is added (ii) pressure is increased? (iii) The temperature is increased?
Answer» 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?

At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCl5is8.3×10−3. If decomposition is depicted as, PCl5(g)↔PCl3(g)+Cl2(g) ΔrH∘=124.0kJmol−1 Write an expression for Kc for the reaction. What is the value of Kc for the reverse reaction at the same termperature? What would be the effect on Kc if (i) more PCl5 is added (ii) pressure is increased? (iii) The temperature is increased?

Answer»

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?

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