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Reaction Quotient and Le Chatelier's Principle

AP Chemistry· difficulty 2/5

For PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) at constant T, the volume is suddenly halved.

PCl₅ ⇌ PCl₃ + Cl₂ Volume halved → P doubles Predict shift

Which way does the equilibrium shift?

  • A

    Toward more moles of gas (right).

  • B

    Toward fewer moles of gas (left, toward PCl₅).

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  • C

    No shift, K does not change.

  • D

    K decreases.

Explanation

Compression favors the side with fewer moles of gas. Reactants: 1 mol; products: 2 mol; equilibrium shifts left.

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