1. Physical Chemistry

Chemical Equilibria — Quiz

Test your understanding of chemical equilibria with 5 practice questions.

Practice Questions

Question 1

For the reaction $H_{2}(g) + CO_{2}(g) \rightleftharpoons H_{2}O(g) + CO(g)$, the equilibrium concentrations at a certain temperature are $[H_{2}] = 0.4 \text{ mol/dm}^3$, $[CO_{2}] = 0.5 \text{ mol/dm}^3$, $[H_{2}O] = 0.3 \text{ mol/dm}^3$, and $[CO] = 0.3 \text{ mol/dm}^3$. What is the value of the equilibrium constant $K_{c}$?

Question 2

Consider the reaction: $2NO(g) + O_{2}(g) \rightleftharpoons 2NO_{2}(g)$. If the partial pressures at equilibrium are $P_{NO} = 0.4 \text{ atm}$, $P_{O_{2}} = 0.3 \text{ atm}$, and $P_{NO_{2}} = 0.6 \text{ atm}$, what is the value of the equilibrium constant $K_{p}$?

Question 3

For the reaction $2SO_{2}(g) + O_{2}(g) \rightleftharpoons 2SO_{3}(g)$, the equilibrium constant $K_{c}$ is 50 at a certain temperature. If the equilibrium concentrations are $[SO_{2}] = 0.2 \text{ mol/dm}^3$ and $[O_{2}] = 0.1 \text{ mol/dm}^3$, what is the equilibrium concentration of $SO_{3}$?

Question 4

A reaction mixture at equilibrium contains the following concentrations: $[A] = 0.3 \text{ mol/dm}^3$, $[B] = 0.4 \text{ mol/dm}^3$, and $[C] = 0.6 \text{ mol/dm}^3$ for the reaction $A(g) + B(g) \rightleftharpoons C(g)$. What is the value of the equilibrium constant $K_{c}$?

Question 5

Consider the reaction: $N_{2}O_{4}(g) \rightleftharpoons 2NO_{2}(g)$. At equilibrium, the partial pressures are $P_{N_{2}O_{4}} = 0.5 \text{ atm}$ and $P_{NO_{2}} = 0.8 \text{ atm}$. What is the value of the equilibrium constant $K_{p}$?