Calculate the molar mass of solute in a solution prepared by dissolving $1 \ g$ in $0.3 \ dm^3$ solvent having osmotic pressure $0.2 \ atm$ at $300 \ K$. $\left[R=0.082 \ dm^3 \ atm \ K^{-1} \ mol^{-1}\right]$
- A$442 \ g \ mol^{-1}$
- B$372 \ g \ mol^{-1}$
- C$390 \ g \ mol^{-1}$
- D$410 \ g \ mol^{-1}$
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