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Osomotic pressure of a solution containi...

Osomotic pressure of a solution containing 2 g dissolved protein per 300 `cm^3` of solution is 20 mm of Hg at `27^@C`. The molecular mass of protein is

A

`"6239.6 g mol"^(-1)`

B

`"12315.5 g mol"^(-1)`

C

`"3692.1 g mol"^(-1)`

D

`"7368.4 g mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`pi=(n_BRT)/V , n_B=W_B/M_B`
`pi=W_B/M_B="RT"/V`
`M_B=W_B/Vxx"RT"/pi=(2xx0.0821xx300xx760)/(0.3xx20)`
=6239.6 g `mol^(-1)`
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Knowledge Check

  • 1 litre of a solution containing 500 g of a protein exerts an osmotic pressure of 0.82 atm at 27^(@)C. The molecular mass of the protein is :

    A
    82000
    B
    50000
    C
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    D
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  • An aqueous solution containing 21.6 mg at a solute in 100 ml of solution has an osmotic pressure of 3.70 mm of Hg at 25^(@)C . The molecular wt of solute in g//mol is

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    1085
    B
    9035
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    700

  • A solution containing 500 g of a protein per litre is isotonic with a solution containing 3.42 g sucrose per litre. The molecular mass of protein is 5 x 10^(x) , hence x is -

    A
    2
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    3
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    D
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