Question

1. 1. A 15.0 mg sample of a protein was dissolved in water to produce 5.00 mL of solution at 25.1 oC. The osmotic pressure of this solution was measured and found to be 6.50 torr. What is the molar mass of this protein?
2. Calculate the molality of a solution containing 0.575 mol of ethanol (CH3CH2OH) and 395 g of water.

Answer 1

1. M = m×R×T/V/p

M = 5.20 kDa

2. 1.46 mol kg^-1