osmotic pressure question?

Question

at 25 degree C, the osmotic pressure of 100 ml of beta-lactoglobulin solution containing 2.4 g of that protein was found to be 0.1 atm. calculate the molecular weight of the protein

Answer 1

π=CRT
but C=mole/V
and mole=mass/MW
so
π=massRT/(MW*V) =>
MW= massRT/(π*V)
Now we need to substitute using the appropriate units
mass should be in g
T in Kelvin, so T=273+25= 298 K
V in L so V=0.1 L
R= 0.082 L.atm/(K.mol), so π should be in atm

MW= 2.4*0.082*298/(0.1*0.1) =5865

Answer 2

i have no idea.