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The equilibrium constant, Kc, for the re...

The equilibrium constant, `K_c`, for the reaction,
`H_2(g) + I_2(g) iff 2HI(g)`
is 56.8 at 800K. When the mixture was analysed, it was found to contain 0.316 mol/L HI at 800K. What are the concentrations of `H_2` and `I_2` at equilibrium? (Assume that initial concentrations of `H_2` and `I_2` were the same.)

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