GRE Subject Test: Chemistry : Equilibrium Constant

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

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Example Questions

Example Question #8 : Equilibrium Constant And Reaction Quotient

In the above reaction, by what factor would the reaction quotient change if the concentration of  were doubled?

Possible Answers:

No change

Correct answer:


For a general chemical equation , where A, B, C, and D are elements and the Greek letters are their coefficients, we have the reaction quotient equation:

We can find the reaction quotient equation for our reaction by substituting the variables.

Notice that the concentration of  is in the denominator and is squared, so doubling the concentration of  changes the reaction quotient by a factor of one-fourth.

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