A solution was made by dissolving 5 mg of hemoglobin in water to give final volume of 1.00 mL. The osmotic pressure of this solution was 1.91 x 10^-3 atm at 25C. Calculate the molar mass of hemoglobin.
pi = iMRT
i = 1 since hemoglobin is nonelectrolyte and doesn't dissociate
T = 298 K
R = constant = .0821 L atm/mol K
1 mL => .001 L
5 mg => .005 g
1.91 x 10^-3 = MRT = (.0821 L atm/mol K)(298 K)(M)
I plugged everything in and ended up with 64046.6 g/mol. Seems a bit high for me. Thank you.