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Dry air was suvvessively passed through ...

Dry air was suvvessively passed through a solution of `5 g` solute in `80 g` water and then through pure water. The loss in weight of solution was `2.5 g` and that of pure water was `0.04 g`. What is mol.wt. of solute?

A

70.31

B

3.125

C

312.5

D

none of these

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The correct Answer is:
A
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