PROBLEMS in EQUILIBRIUM

1. Write the equilibrium expression of the following reactions:2Ag2CO3 (s) 4Ag (s) + 2CO (g) + O2 (g)

H2O (g) + C (s) CO (g) + H2 (g)

6Ca (s) + 2NH3 (g) 3CaH2 (s) + Ca3N2 (s)

PCl5 (s) PCl3 (l) + Cl2 (g)

C (s) + CO2 (g) 2CO (g)

2. Write the chemical equation for each reaction. Keq = [COCl2] [CO][Cl2]

Keq = [PCl3]2[O2] [POCl3]2

3. At a temperature of 927oC, the equilibrium concentrations for the reaction

CO (g) + 3 H2 (g) CH4 (g) + H2O (g)

are [CO] = 0.3065 M, [H2] = 1.46 M, [CH4] = 0.1935 M and [H2O] = 0.1935 M.

Calculate the value of the equilibrium constant for this reaction at this temperature.

4. In the study of the conversion of methane to other fuels, a chemical engineer mixes gaseous CH4 and H2O in a 0.32-L flask at 1200 K. At equilibrium, the flask contains 0.26 mol of CO, 0.091 mol of H2, and 0.41 mol of CH4. What is [H2O] at equilibrium?

5. The concentrations of the substances involved in the previous reaction at 927oC are [CO]=0.5 M, [H2]=01 M, [CH4] = 0.25 M and [H2O] = 0.25 M.

Is the reaction at equilibrium? If not, in which direction will it proceed?

Equilibrium constant expression for gaseous system

Relationship between Q, Keq, and the position of equilibriumQ = KeqQ=0KeqQ = Q < Keq Q > Keq

Reaction proceeds toward right, forming more productsReaction proceeds toward left, forming more reactantsEQUILIBRIUM