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Q37. (a) What is meant by the conjugate acid-base pair ? Find the conjugate acid/base for the following species: HCO3-, and HS-. (b) At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCls is 8.3 x10-3. If decomposition is depicted as, PCls (g) + PCI; (g) + Cl2 (g) AH°= 124.0 kJ mol-1 (i) Write an expression for Kc for the reaction. (ii) What is the value of Kc for the reverse reaction at the same temperature ? OR ( + de doutorad o Raffo at Daffolti

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Q1

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?

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Q2

At 473 K, equilibrium constant Kcfor 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 Kc for the reaction.

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

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

View Solution
Q3
At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCl5 is 8.3×10−3. If decomposition is depicted as,
PCl5(g)⇌PCl3(g)+Cl2(g) ΔrH⊖=124.0kJmol−1
(a) Write an expression for Kc for the reaction.
(b) What is the value of Kc for the reverse reaction at the same temperature?
(c) What would be the effect on Kc if (i) more PCl5 is added (ii) pressure is increased (iii) the temperature is increased ?
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Q4
At 473K, equilibrium constant, Kc for decomposition of phosphorus pentachloride, PCl5 is 8.3×10−3. If decomposition is depicted as:
PCl5(g)⇌PCl3(g)+Cl2(g);△rH0=124.0kmol−1 what would be the effect on reaction if the temperature is increased?
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Q5
Phosphorus pentachloride decompose according to the reaction PCl3(g)⇌PCl3(g)+Cl2(g), 1 mol of PCl5 is placed in a 500 mL closed reaction vessel and allowed to reach equilibrium with decomposition products, phosphorus trichloride and chlorine at 523 K. Equilibrium constant, Kc=1.80. What is the composition of the mixture at equilibrium?
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