If of an aqueous solution of a protein contains of protein, the osmotic pressure of the solution at…

If $200\text{ cm}^3$ of an aqueous solution of a protein contains $1\cdot26\text{ g}$ of protein, the osmotic pressure of the solution at $300\text{ K}$ is found to be $2\cdot57 \times 10^{-3}\text{ atm}$. Calculate the molar mass of protein. ($R = 0\cdot0821\text{ L atm K}^{-1}\text{ mol}^{-1}$)