Equilibrium

The equilibrium constant for Kc for the reaction shown is 54.3 at 430 degrees C.

                      H2(g) = I2(g) = 2 HI(g)

At the start if the reaction there are 0.714 moles of H2, 0.984 mole of I2 and 0.886 mole of HI in a 2.00 liter reaction chamber.  

At equilibrium, what are the concentrations of the gases-

[H2]

[I2]

and

[HI] ?