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Solve this particular problem:

At a particular temperature, 12.0 moles of SO3 is placed into a 3.0L rigid containerand the SO3 dissociates by the reaction

2SO3 (g) <=> 2SO2 (g) + O2 (g)

At equilibrium, 3.0 moles of SO2 is present.  Calculate K for this reaction.

It'd be nice to see how one would do this step-by-step and what I should be thinking when going through problems like these.  The subject for this problem would be 'Equilibrium Calculations'.

 

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