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What do you mean by relative lowering of...

What do you mean by relative lowering of vapour pressure? Calculate the relative lowering of Vapour pressure of a solution formed by dissolving 50 g of urea `(NH_2 CONH_2)` in 850g of water.(Given vapour pressure of pure water at 298K= 23.8mm of Hg.)`

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SHARAM PUBLICATION-SET 14-EXERCISE
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