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# Equilibrium constant changes with multiples of equations? watch

1. How can you decide how to write the equilibrium constant if it changes with different multiples? e.g. H2 + I2 -> 2HI with various concentrations for each, 2H2 + 2I2 -> 4HI is the same equation multiplied by 2 but if you put in the same concentrations the calculation will come out different for Kc. How do you deal with this and choose the correct balanced equation to write your kc expression?
2. (Original post by jefffrey)
How can you decide how to write the equilibrium constant if it changes with different multiples? e.g. H2 + I2 -> 2HI with various concentrations for each, 2H2 + 2I2 -> 4HI is the same equation multiplied by 2 but if you put in the same concentrations the calculation will come out different for Kc. How do you deal with this and choose the correct balanced equation to write your kc expression?
You are partially correct. The only changes are when there is an unequal moles total on each side.

In that case you just have to define an equilibrium constant for the most appropriate balanced equation.

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