<u>Answer:</u> The molar mass of the protein is 13392.86 g/mol
<u>Explanation:</u>
To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

where,
= osmotic pressure of the solution = 0.138 atm
i = Van't hoff factor = 1 (for non-electrolytes)
M = molarity of solute = ?
R = Gas constant = 
T = temperature of the solution = ![28^oC=[273+28]=301K](https://tex.z-dn.net/?f=28%5EoC%3D%5B273%2B28%5D%3D301K)
Putting values in above equation, we get:

To calculate the molecular mass of solute, we use the equation used to calculate the molarity of solution:

We are given:
Molarity of solution = 0.0056 M
Given mass of protein = 0.150 g
Volume of solution = 2 mL
Putting values in above equation, we get:

Hence, the molar mass of the protein is 13392.86 g/mol