Question

Osmotic pressure of a solution containing 2 g dissolved protein per 300 cm³ of solution is 20 mm of Hg at 27°C. The molecular mass of protein is ______.

Options

• 6239.3 g mol^-1

• 12315.5 g mol^-1

• 3692.1 g mol^-1

• 7368.4 g mol^-1

Answer 1

Osmotic pressure of a solution containing 2 g dissolved protein per 300 cm³ of solution is 20 mm of Hg at 27°C. The molecular mass of protein is 6239.3 g mol^-1.

Explanation:

`pi = ("n"_"B""RT")/"V" : "n"_"B" = "w"_"B"/"M"_"B"`

`pi = "w"_"B"/"M"_"B" xx "RT"/"V"`

`=> "M"_"B" = "W"_"B"/"V" xx "RT"/pi`

`= (2 xx 0.0821 xx 300 xx 760)/(0.3 xx 20)`

= 0.0821 × 100 × 760

= 6239.6 g mol^-1