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Helium gas is added to the equilibrium PCl5(g) <=> PCl3(g) + Cl2(g) at constant temperature and constant total pressure. What happens to the equilibrium constant of the reaction?

1. Increase
2. Decrease
3. Unchange
4. Nothing can be said

Correct answer: Unchange

Solution

Kp/Kc are functions of temperature alone; introducing an inert gas changes partial pressures/volume and may shift the position of equilibrium, but K itself stays constant.

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