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Dry air was passed successively through ...

Dry air was passed successively through a solution of `5 g` of a solute in `180 g` of water and then through pure water. The loss in the weight of solution was `2.50 g` and that of pure solvent `0.04 g`. The molecular weight of the solute is

A

70.31

B

3.125

C

312.5

D

none of these

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