Osmotic 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:

Question

Osmotic 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) 6239.3 g mol -1 (B) 12315.5 g mol -1 (C) 3692.1 g mol -1 (D) 7368.4 g mol -1

Tardigrade Admin · Accepted Answer

π=( n B RT / V ): n B =( w B / M B ) π=( w B / M B ) × ( RT / V ) ⇒ M B =( W B / V ) × ( RT /π) =(2 × 0.0821 × 300 × 760/0.3 × 20) =0.0821 × 100 × 760=6239.6 g mol -1

Q. Osmotic pressure of a solution containing $2 g$ dissolved protein per $300 c m^{3}$ of solution is $20 mm$ of $H g$ at $2 7^{\circ} C$ . The molecular mass of protein is:

$6239.3 g m o l^{- 1}$

$12315.5 g m o l^{- 1}$

$3692.1 g m o l^{- 1}$

$7368.4 g m o l^{- 1}$

$π = \frac{n _{B} RT}{V} : n_{B} = \frac{w _{B}}{M _{B}}$

$π = \frac{w _{B}}{M _{B}} \times \frac{RT}{V}$

$\Rightarrow M_{B} = \frac{W _{B}}{V} \times \frac{RT}{π}$

$= \frac{2 \times 0.0821 \times 300 \times 760}{0.3 \times 20}$

$= 0.0821 \times 100 \times 760 = 6239.6 g m o l^{- 1}$

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

6239.3gmol−1

12315.5gmol−1

3692.1gmol−1

7368.4gmol−1