Exactly 375.0 mg of an unknown protein is dissolved in enough water to give 50.00 mL of solution, and the osmotic pressure was determined as 3.25 mmHg at 298 K. Estimate the molar mass of this protein.
A. 42,900 g/mol B. 3,600 g/mol C. 56,400 g/mol D. 139,000 g/mol