At a certain temperature, a 29.0-L contains holds four gases in equilibrium. Their masses are: 3.5 g SO_{3}, 4.6 g SO_{2}, 24.2 g N_{2}, and 0.98 g N_{2}O.

What is the value of the equilibrium constant at this temperature for the reaction of SO_{2} with N_{2}O to form SO_{3} and N_{2} (balanced with lowest whole-number coefficients)?

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