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2HI --> H2 + I2 a mixture of 0.500 M HI, 0.100 M H2, and 0.100...

2HI --> H2 + I2 a mixture of 0.500 M HI, 0.100 M H2, and 0.100 M I2 is placed in a reaction vessel and allowed to come to equilibrium at a temperature of 745 K. The value of the equilibrium constant at that temperature is 0.0200. What is the concentration of HI at equilibrium?

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