Chemistry 104 Study Groups

EQUILIBRIUM PROBLEM
ANSWER
 

Exercises

  The reaction H2(g) + I2(g) <––> 2HI(g) has Kc=160 at 500K.

  1. If 0.05 mol H2(g) and 0.05 mol I2(g) are put into a 5.00 L flask and allowed to react, what is the equilibrium composition of the system?
  2. If 0.03 mol H2(g), 0.01 mol I2(g) and 0.02 mol HI(g) are present in a 5.00 L flask at 500K at a certain time, is the reaction at equilibrium? If not, in which direction will the reaction proceed? What would be the equilibrium composition of the mixture?
  3. Determine the equilibrium composition of the system if 0.05 mol HI(g) is placed into a 5.00 L flask and allowed to come to equilibrium.

 
 

Answer

  1. [H2]=[I2]=0.0014M [HI]=0.017M

  2. Reaction is not at equilibrium
    Reaction is moving toward products
    [H2]= 0.0041 M [I2]=0.00009MM [HI]=0.0078M

  3. [H2]=[I2]=6.83 x 10-4M [HI]=8.63 x 10-3M

 

Explanation

 

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