Equilibrium Problems Worksheet


SCH4U –Equilibrium Problems


1) 3.4 mol/L of sulfur dioxide and 2.0 mol/L of oxygen are introduced into a vessel and heated to a certain temperature. a.

Find the Kc if the concentration of sulfur dioxide at equilibrium is measured to be 2.2 mol/L. b.

Find the percent reaction.


2 (g)

+ O

2 (g)

<=====> 2SO

3 (g)

2) Ammonia and oxygen react to form nitogen monoxide and water. When 1.280 mol of ammonia and 2.240 mol of oxygen are introduced into a 3.200 L container the reaction completes to 2.5%. Find the equlibrium constant.

3) Do #7b on page 447.

4) Do #9 on p. 449

5) Nitrogen gas and hydrogen gas combine together to form ammonia gas (NH


) in the Haber process. Initially 1.5 mol/L of nitrogen gas and 1.5 mol/L of hydrogen gas are introduced into a sealed vessel. After some time, the concentration of hydrogen is measured to be 0.20 mol/L.

a) Find the equilibrium constant value Kc (4 marks) b) Calculate the percent reaction. (2 marks) c) What is the Kc value for the reverse reaction?

6) Do # 5 on p. 449

7) Do # 4 on p. 449

8) 1.8 moles of fluorine and 1.2 moles of chorine are place in a 3.0 L flask. After some time, the concentration of chlorine trifluoride is found to be 0.20 mol/L.


2 (g)

+ 3F

2 (g)

<=====> 2ClF

3 (g) a) Find the concentrations of all three compounds at equilibrium. (4 marks) b) Find the equilibrium constant. (2 marks) c) Find the percent reaction. (2 marks)