Determining ke for equilibrium concentrations

Question

Assignment:

Question 1. Calculate K_e for the following (equilibrium concentrations given below substances)

a) H₂ (g)     +     Br₂ (g)          ↔     2 HBr (g)     +     heat

  [0.513]            [0.62]                      [0.346]

Ke = (0.346)^2/(0.513)(0.62) = 0.376

b) N₂O₄ (g)     +     heat     ↔     2 NO₂ (g)   

 [0.0325]                                     [0.022]

Ke = [NO₂]^2/[N₂O₄] = (0.022)^2/0.0325 = 0.149

c) NH₄SH (g)     ↔     NH₃ (g)     +     H₂S (g)     +     heat    

[0.027]                   [0.0234]             [0.209]

Ke = [NH₃][H₂S]/[NH₄SH] = (0.0234)(0.209)/(0.027) = 0.181

Question  2. For all three of the equilibria in problem #1 predict (1) how Ke is affected by an decrease in temperature, (2) predict how the equilibrium will shift when pressure is increased, (3) predict how the equilibrium will shift when the concentration of the underlined substance is increased, and (4) predict how the equilibrium will shift when the temperature is increased.

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