7. When 1 g of activated carbon is introduced into 100 ml of an aqueous solution of methylene blue, the concentration of the dye changes from the initial 1 * 10-4 mol/l to the final one, equal to 6 * 10-5 mol/l. When 2 g of coal was added to the same volume of the original solution, the equilibrium concentration was 4*10-5 mol/l. Assume that the function is described by the Langmuir equation. Calculate the adsorption equilibrium constant.

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