Achiever test #3 -43

[Glycogen]

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I've got a bit lost here.In the solution it does not multiply .5 mol SO3 by 2 since the coefficient is 2.Is this because the molarity is already given so we don't need to multiply it anymore or something else.As I remember Keq for this reaction is 2(.5)^2/(O2)(2SO2)^2!


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)


Thank you.