The Equilibrium Constant

• Consider the Reaction:

  • H2(g) + I2(g) ? 2 HI(g)

• If you mix together H2(g) with I2(g) the reaction will proceed leaving you with a mixture of H2(g), I2(g), and HI(g).

• If you simply place HI(g) in a container you will find, on analysis, the same three gases.

?

K = [HI]2/([H2][I2]) = 56

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