Tert-Butyl alcohol is a solvent with a Kf of 9.10 ∘C/m and a freezing point of 25.5 ∘C. When 0.807 g of an unknown colorless nonelectrolyte liquid was dissolved in 11.6 g of tert-butyl alcohol, the solution froze at 15.3 ∘C. Which of the following is most likely the identity of this unknown liquid?

ethylene glycol (molar mass = 62.07 g/mol)
1-octanol (molar mass = 130.22 g/mol)
glycerol (molar mass = 92.09 g/mol)
2-pentanone (molar mass = 86.13 g/mol)
1-butanol (molar mass = 74.12 g/mol)
Part B

A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.170 g of this subunit was dissolved in enough water to produce

2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138 atm. What is the molar mass of the protein?