$A$ solution of a nonvolatile solute is obtained by dissolving $0.8 \ g$ in $0.3 \ dm^3$ of water. The solution has an osmotic pressure of $0.2 \ atm$ at $300 \ K$. Calculate the molar mass of the solute. $[R = 0.082 \ atm \ dm^3 \ K^{-1} \ mol^{-1}]$
- A$300 \ g \ mol^{-1}$
- B$340 \ g \ mol^{-1}$
- C$328 \ g \ mol^{-1}$
- D$352 \ g \ mol^{-1}$
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