[odicon]

Assuming that the osmotic pressure of a sample of sea water at 10 C is 20.9 atm, calculate the work required under reversible conditions at this constant temperature to prepare 96 litre of pure water from this sea water. (Take the available volume of sea water as infinite and therefore unchanging in composition as 96 litre of pure water is extracted). Express your answer in Joules.

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I do not even know how to visualize the situation. Any help or hint to which direction I should take would be appreciated.