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0.9 g urea when dissolved in 45 g water ...

0.9 g urea when dissolved in 45 g water caused elevation of `0.17^(@)C` in b.p. Calculate molecular elevation constant of water.

Text Solution

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`DeltaT_(b)=K_(b)xx(w_(1)xx1000)/(w_(2)xxM_(1))`
`K_(b)=(DeltaT_(b)xxw_(2)xxM_(1))/(w_(1)xx1000)`
`=(0.17xx45xx60)/(0.9xx1000)`
=5.1 K" Kg mole"^(-1)
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