241. It has been experimentally established that the value of the maximum adsorption on coal is 3.0 * 10-3 mol / g. The value of a = 6.0 * 10-2 mol / l. What mass of propionic acid (adsorbate) was absorbed from a solution in which an equilibrium concentration of 0.1 mol/l was established if the mass of the adsorbent was 1 g?

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