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Answer any three of the following questi...

Answer any three of the following questions.
a) 31 g of an unknown molecular material is dissolved in 500 g of water. The resulting solution freezes at `271.14` K. Calculate the molar mass of the material. Given : `K_t` for water `=1.86"KK gmol1" T_(t)^(@)` of water `=273K`.

Text Solution

Verified by Experts

`M_2 = (k_f xx w_2 xx 1000)/(Delta T_f xx w_1)`
`M_2 = (1.86 K kg mol^(-1) xx 31.0 g xx 1000 g kg^(-1))/(1.86 K xx 500 g)`
`M_2 = 62 g mol^(-1)`
(b) When a pressure more than the osmotic pressure is applied on a concentrated solution solvent flows from the concentrated solution to dilute solution through semi permeable membrane/ pure solvent flows out of the solution through semi permeable membrane if a pressure larger than the osmotic pressure is applied.
Desalination of water.
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(a) 31 g of an unknown molecular material is dissolved in 500 g of water. The resulting solution freezes at 27.14 K. Calculate the molar mass of the material. [Given: K, for water 1.86 Kgmol^(-1) , T_(f)^(0) of water=273К]. (b) What is reverse osmosis? Mention its use.

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Knowledge Check

  • If 10.0 g of a non-electrolyte dissolved in 100 g of water lowers the freezing point of water by 1.86^(@)C , the molar mass of the non-electrolyte is ( K_(f)=1.86 Km^(-1) )

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