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5 g of a substance when dissolved in 50 ...

5 g of a substance when dissolved in 50 g water lowers the freeezing by `1.2^(@)C`. Calculate molecular wt. of the substance if molal depression constant of water is `1.86^(@)C` K kg `mol^(-1)`.

Text Solution

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`M=(1000 times K_1 times w_1)/(Delta T_1 times w_2)`
`M=(1000 times 1.86 times 5)/(1.2 times 50)=155`
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