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 equilibrium

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

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

How must the concentration of N H 3 change to reach equilibrium if the reaction quotient is less than the equilibrium constant?

  • AIncrease
  • BStay the same
  • CDecrease

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 N O 2 ?

  • AIncrease
  • BStay the same
  • CDecrease

If the change in the pressure of N O 2 is 28 torr as a mixture of the four gases reaches equilibrium, how much would the pressure of O 2 have changed?

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