For the equilibrium PCl5(g) ---- PCl3(g) + Cl2(g), the equilibrium constant Kp h

ID: 850950 • Letter: F

Question

For the equilibrium PCl5(g) ---- PCl3(g) + Cl2(g), the equilibrium constant Kp has the value 0.497 at 500 K. A gas cylinder at 500 K is charged with PCl5(g) at an initial pressure of 1.66 atm. What are the equilibrium pressures of PCl5, PCl3, and Cl2 at this temp? For the equilibrium PCl5(g) ---- PCl3(g) + Cl2(g), the equilibrium constant Kp has the value 0.497 at 500 K. A gas cylinder at 500 K is charged with PCl5(g) at an initial pressure of 1.66 atm. What are the equilibrium pressures of PCl5, PCl3, and Cl2 at this temp?

Explanation / Answer

PCl5(g) ---- PCl3(g) + Cl2(g)

1.66 .........0...............0

1.66-X.......X..............X

Kp = X^2 / (1.66 - X)

=> 0.497 = X^2 / (1.66 - X)

=> X = 0.693 atm

Equilibrium pressure of Cl2 = PCl3 = x = 0.693 atm

Eq pressure of PCl5 = 1.66 - 0.693 = 0.967 atm

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For the equilibrium PCl5(g) ---- PCl3(g) + Cl2(g), the equilibrium constant Kp h

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