Ammonia will decompose into nitrogen and hydrogen at high temperature. An industrial chemist studying this reaction fills a 75.0 L tank with 4.2 mol of ammonia gas, and when the mixture has come to equilibrium measures the amount of nitrogen gas to be 0.63 mol. Calculate the concentration equilibrium constant for the decomposition of ammonia at the final temperature of the mixture. Round your answer to 2 significant digits. K = 0 с

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