771. Potassium hydroxide solution with KOH concentration 56 g/l was obtained by electrolysis of potassium chloride solution. During the same time, 20.2 g of copper was released in the copper coulometer. The current efficiency during KCl electrolysis is 73.6%. Determine the volume of the resulting KOH solution. Give a detailed diagram of the electrolysis of a KCl solution on carbon electrodes.

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