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Try this! A 5% solution of canesugar (mol. wt. =342) is isotonic with 1% solution of a substance X . The molecular weight of X is

A 5% solution of canesugar (mol. wt. =342) is isotonic with 1% solution of a substance X . The molecular weight of X is

  • Option 1)

    34.2

  • Option 2)

    171.2

  • Option 3)

    68.4

  • Option 4)

    136.8

 
Answers (1)
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S subam

As we learned 

 

Isotonic solutions -

Solutions having same osmotic pressures.

- wherein

\pi _{1}= \pi _{2}

C _{1}T _{1}= C _{2}T _{2}

at constant Temp.

C _{1}= C _{2}

 

   Molar\: concentration\: of \: cane\: sugar=\frac{5}{342}\times \frac{1000}{100}=\frac{50}{342}

Molar\: concentration\: of\: X=\frac{1}{m}\times \frac{1000}{100}=\frac{10}{m}

\frac{10}{m}=\frac{50}{342}\: \: or\: \: m=68.4

 

 


Option 1)

34.2

Option 2)

171.2

Option 3)

68.4

Option 4)

136.8

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