Equilibrium Concentrations?

A mixture of 0.5mol H2 and 0.5mol I2 was placed in a 1.0L container at 430�C.The equilibrium Kc for the reaction H2(g) + I2(g) <-> 2HI(g) is 54.3 at this temperature. Calculate the equilibrium concentrations of H2, I2, and HI.