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Question:
difference between Qc and Kc [Equilibrium]
Answer:

Qc

Kc

Qc  It is the reaction quotient.

Kc  is the equilibrium constant.         

It is the ratio of activity (or concentration) of products by reactants raised to thier stoichiometric coefficients (NOT NECESSARILY AT EQUILIBRIUM)

It is the ratio of activity (or concentration) of products by reactants raised to thier stoichiometric coefficients (AT              EQUILIBRIUM)

Its value varies as the reaction proceeds

It is constant for a given reaction at a given temperature.

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