Question

Consider the following system at equilibrium where AH° -87.9 kJ/mol, and K 83.3 , at 500 K. PCI3 (g)Cl2 (g)= PCI5 (g) When 0.

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Answer #1

1)

Since temperature is not changing, Kc would be constant

Answer: will not change

2)

Qc = [PCl5]/[PCl3][Cl2]

since we removed PCl5, Qc would decrease and it becomes less than Kc

Answer: less

3)

Since Qc < Kc, the reaction moves in forward direction to re establish equilibrium

Answer: option 1

4)

Since Cl2 is reactant which is getting used up as reaction moves in forward direction, its concentration would decrease

Answer: decreases

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