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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

31.25g/mole

B

3.125 g/mole

C

312.5 g/mole

D

40 g/mole

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