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2A+B equilibrium C+D when 2.00 mol of A and 0.800 mol B are placed in a...

2A+B equilibrium C+D
when 2.00 mol of A and 0.800 mol B are placed in a 2L container and allowed to come equilibrium. it is found that 0.20 M in D are present at equilibrium. what is the value of K for this reaction

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