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Chemical Equilibrium Practice Questions

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Updated on Sep 25, 2011

Review the following concepts if needed - Chemical Equilibrium Study Guide

Practice Questions

Write the equilibrium expression for the following reactions.

1. 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)
2. H2(g) + Br2(g) 2HBr(g)
3. 2N2O5(g) 4NO2(g) + O2(g)
4. PCl5(s) PCl3(l) + Cl2(g)
5. H2SO4(aq) H2O(l) + SO3(g)
6. H2(g) + I2(g) 2HI(g)

 

Calculate the equilibrium concentrations for the following processes:

7. For the Haber process where the initial values are [N2(g)] = 1.23 M, [H2(g)] = 5.00 M, and [NH3(g)] = 0 M.
8. For the Haber process where the initial values are [N2(g)] = 3.5 * 10–3 M, [H2(g)] = 1.2 * 10–2 M, and [NH3(g)] = 0 M.
9. For H2(g) + I2(g) 2HI(g) where the initial values are [H2(g)] = 2.5 M, [I2(g)] = 10.0 M, and [2HI(g)] = 0 . Keq = 1.4 * 10–2. Note the quadratic equation must be used to solve for x.

 

Given the following chemical process for the production of hypochlorous acid,

H2O(g) + Cl2O(g) 2HClO(g)

predict whether the equilibrium will shift to the right or left when

10. water is added.
11. hypochlorous acid is removed.
12. water is removed.
13. H2O(g) is tripled and Cl2O(g) is halved.

Answers

1.
2.
3.
4. PCl5(s) PCl3(l) + Cl2(g)
5. H2SO4(aq) H2O(l) + SO3(g)
6. H2(g) + I2(g) 2HI(g)
7. [N2(g)] = 1.23 M. [H2(g)] = 4.99 M, and [NH3(g)] = 0.00923 M
8. [N2(g)] = 3.5 * 10–3 M, [H2(g)] = 1.2 * 10–2 M, and [NH3(g)] = 1.8 * 10–13 M
9. [I2(g)] = 9.68 M. [H2(g)] = 2.18 M, and [HI(g)] = 0.632 M
10. Right
11. Right
12. Left
13. Right
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