Chapter 12

A saturated solution is made by dissolving \(0.400 \mathrm{~g}\) of a polypeptide (a substance formed by joining together in a chainlike fashion a number of amino acids) in water to give \(1.00 \mathrm{~L}\) of solution. The solution has an osmotic pressure of 3.74 torr at \(27{ }^{\circ} \mathrm{C}\). What is the approximate molecular mass of the polypeptide?

What is the expected van't Hoff factor for \(\mathrm{K}_{2} \mathrm{SO}_{4}\) in an aqueous solution, assuming \(100 \%\) dissociation?