Worksheet: Concentration Changes in Equilibria

In this worksheet, we will practice calculating changes in the concentrations of reactants and products due to shifts in the position of equilibrium.

Q1:

Consider the following equilibrium. 4NO()+6HO()4NH()+7O()2232gggg

Which of the following is the correct expression for the equilibrium constant (𝐾c) of the reaction?

  • A 𝐾 = [ ] [ ] [ [ ] c 3 2 2 2 N H O N O ] H O
  • B 𝐾 = [ ] [ ] [ ] [ ] c 2 2 3 2 4 N O 6 H O 4 N H 7 O
  • C 𝐾 = [ ] [ ] [ ] c 3 2 2 2 N H O N O [ H O ]
  • D 𝐾 = [ ] [ ] [ ] [ ] c 2 2 3 2 N O H O N H O
  • E 𝐾 = [ ] [ ] [ [ ] c 3 2 2 2 4 N H 7 O 4 N O ] 6 H O

How must the concentration of NH3 change to reach equilibrium if the reaction quotient is less than the equilibrium constant?

  • AIncrease
  • BDecrease
  • CStay the same

If the reaction were at equilibrium, how would a decrease in pressure (from an increase in the volume of the reaction vessel) change the pressure of NO2?

  • AStay the same
  • BDecrease
  • CIncrease

If the change in the pressure of NO2 is 28 torr as a mixture of the four gases reaches equilibrium, how much would the pressure of O2 have changed?

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