A protein solution with concentration 80 g/L has an osmotic pressure of 0.0205 atm at 27oC. What is the approximate molecular weight of the protein? (The gas constant is 0.082 L-atm/K-mol.)

A) 96,000

B) 192,000

C) 48,000

D) 1,500

Your Answer: N/A

Correct Answer: A

Explanation: n/V = Π/RT

= 0.0205 / (0.082 x 300)

= 0.00083 M

Now, 1 L contains 80 g of protein.

Therefore, mw = 80 g / 0.00083 mol

= 96,000 g/mol

Hi there, as we can see from the explanation above, the value of 0.0205 has been given as the value of V, how is this possible, when 0.0205 is in atm, therefore one would assume it is used for pressure....can anyone explain

Thanks