What would be the reaction quotient for the reaction $2 \mathrm {~A} ( g ) f \quad 2 \mathrm {~B} ( g ) + \mathrm { C } ( g )$ if the pressure is decreased by a factor of 2 at constant temperature?

Question

Quizplus · Accepted Answer

The reaction quotient is given by Q = ([B]^2[C])/([A]^2). If the pressure is decreased by a factor of 2, then the concentration of each species is also decreased by a factor of 2. Therefore, the reaction quotient becomes Q' = ([B]^2[C])/([A']^2) = ([B]^2[C])/([A]^2/4) = 4([B]^2[C])/([A]^2) = 4Q. Since the equilibrium constant K does not depend on the concentrations of the reactants and products, and only on the temperature, the new reaction quotient Q' can be related to K by Q' = 4Q = 4K. Therefore, the correct answer is choice C, Q = (1/2)K.

What Would Be the Reaction Quotient for the Reaction 2 A(g)f2 B(g)+C(g)2 \mathrm {~A} ( g ) f \quad 2 \mathrm {~B} ( g ) + \mathrm { C } ( g )2 A(g)f2 B(g)+C(g)

What Would Be the Reaction Quotient for the Reaction $2 \mathrm {~A} ( g ) f \quad 2 \mathrm {~B} ( g ) + \mathrm { C } ( g )$