DAT Achiever-test3-genchem #43

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askadds

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*never mind, figured it out*

What is the concentration of O2(g) in equilibrium with 0.50 mol/liter of SO3(g) if the equilibrium constant at certain fixed temperature is 500 liter/mol?

2 SO2(g) + O2(g) <-> 2 SO3(g)

--> why is setting up the equilibrium constant (especially products) is incorrect:

500 (mol/l) = [(2(.5))^2] / [(2x^2)(x)]

how come in the solution, the [SO3] is not mulplied by the coefficient 2 and then squared like the [S02] in the denominator?

solution:

500 (mol/l) = [(.5)^2] / [(2x^2)(x)]

any get what im saying?
 
Because you are given the amount the coefficient is ignored for the qty. It is still required to be used for the exponent. I hope that helps its hard for me to put into words.
 
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