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Elevation in Boiling Point

Dry air is pa...

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Dry air is passed through a solution containing 20 gram of an organic non volatile solute in 250 ml of water. Then the air was passed through pure water and then through a U tube containing anhydrous CaCl2. The mass loss in solution is 26 gram and the mass gained in the U tube is 26.4 8 gram. Calculate the molecular mass of the organic solute.

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