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In Ostwald and Walker's appratus, dry ai...

In Ostwald and Walker's appratus, 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 anhydroous `CaCl_(2)`. The mass lost in solution is 26 gram and the mass gained in the U-tube is 26.48 gram. Calculate the molecular mass of organic solute.

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78 g
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