[Triglyceride]

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.

[tamim83]

That's actually fairly close.  Wikipedia says its around 68,000 daltons (or amu).  Your math seems to be fine.