The equilibrium constant, k = 55.64 for H2 (g) + I2 (g) 2HI (g) has been determined at 425°C. If 1.00 mol each of H2 and I2 are placed in a 0.5 L flask at 425°C, what are the concentrations of H2, I2 and HI when equilibrium has been achieved?

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