20. Solving a chemistry problem
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6. A piece of marble is dissolved in 1 liter of 1 N hydrochloric acid. After 5 minutes, the acid concentration became 0.9 mol/L. After 10 minutes - 0.81, after 20 minutes - 0.67 mol / l. What is the rate constant of this heterogeneous process if the marble surface has not changed?
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