Law of Mass Action

Chemistry ⇒ Chemical Kinetics and Equilibrium

Law of Mass Action starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Law of Mass Action. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

Explain the significance of the equilibrium constant derived from the Law of Mass Action.

Explain why pure solids and pure liquids are not included in the equilibrium constant expression.

Explain why the Law of Mass Action does not apply to reactions involving non-ideal solutions.

For the reaction 2A + B ⇌ 3C, if [A]=0.1 M, [B]=0.2 M, [C]=0.3 M at equilibrium, calculate K_c.

For the reaction 2A ⇌ B, if the initial concentration of A is 1.0 M and at equilibrium 0.6 M of A remains, calculate the equilibrium concentration of B.

For the reaction 2NO_2(g) \rightleftharpoons N_2O_4(g), if K_c = 0.5 at a certain temperature, what does this indicate about the position of equilibrium?

For the reaction 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g), write the expression for K_c.

For the reaction A + 2B ⇌ C, if the initial concentrations are [A]=1.0 M, [B]=2.0 M, and at equilibrium [C]=0.5 M, calculate the value of K_c.

For the reaction A + B ⇌ C + D, if the equilibrium concentrations are [A]=0.2 M, [B]=0.3 M, [C]=0.4 M, [D]=0.5 M, calculate K_c.

For the reaction A + B ⇌ C, if K_c = 10 and [A]=0.2 M, [B]=0.2 M, what must be the equilibrium concentration of C?

For the reaction H_2(g) + I_2(g) \rightleftharpoons 2HI(g), if [H_2] = 0.2 M, [I_2] = 0.2 M, and [HI] = 0.4 M at equilibrium, calculate K_c.

For the reaction X + Y ⇌ Z, if the equilibrium constant K_c = 0.01, which side is favored at equilibrium?

If the concentration of a product is increased at equilibrium, what will happen to the value of K_c?

State the Law of Mass Action.

Write the equilibrium constant expression for the reaction: N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g).