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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 `mole^(-1)`.

Text Solution

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`M=(1000xxK_(f)xxw_(1))/(Delta T_(f)xxw_(2))`
`M=(1000xx1.86xx5)/(1.2xx50)=15.41`
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