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A solution of sucrose (molar mass =342) ...

A solution of sucrose (molar mass =342) is prepared by dissolving 68.4 g in 1000 g of water. Calculate
The osmotic pressure at 273 K.

A

`2`

B

`3`

C

`4`

D

`4.805`

Text Solution

Verified by Experts

The correct Answer is:
D
Osmotic pressur the of solution can be calculated by using the relation
`piV=n_(B)RT`
`:. N_(B)=W_(B)/(Mw_B)=68.2/352=0.2`
`V=1 L`,`R=0.082 L "atm" K^(-1) "mol"^(-1)`,
T=273 + 20=293 K
`:.pi xx 1 =0.2 xx 0.082 xx 293`
`pi=4.805 "atm"`
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Knowledge Check

  • A solution of sucrose (molar mass=342 g "mol"^(-1) ) has been prepared by dissolving 69.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be : ( K_f for water=1.86K kg "mol"^(-1) )

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  • At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg, lowering of vapour pressure will be : Molar mass of urea =60 g mol^(-1) )

    A
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    B
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    D
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