Areaction mixture that consisted of 0.4 mol h2 and 1.55 mol i2 was introduced into a 2 l flask and heated. at the equilibrium, 60% of the hydrogen gas had reacted. what is the equilibrium constant kc for the reaction h2(g) + i2(g) ⇀↽ 2 hi(g) at this temperature? a reaction mixture that consisted of 0.4 mol h2 and 1.55 mol i2 was introduced into a 2 l flask and heated. at the equilibrium, 60% of the hydrogen gas had reacted. what is the equilibrium constant kc for the reaction h2(g) + i2(g) ⇀↽ 2 hi(g) at this temperature?

Explanation:

1) Equilibrium equation (given):

2) Equilibrium constant expression:

3) Determine the conentrations from the stoichiometry:

a) Number of moles:

                     H₂ (g)              +             I₂ (g)           ⇄     2HI (g)

Start               0.4                                 1.55                         0

Change        - 0.4×0.6 = - 0.24        -  0.24                  + 0.24×2 = + 0.48

                   ---------------------------       -------------              --------------------------

End                0.16                               1.31                       0.48

b) Concentrations:

4) Compute Kc: