What is the molar mass of a solute if a solution is prepared by dissolving $4.5 \ g$ of solute in $3 \ dm^3$ of water having an osmotic pressure of $0.25 \ atm$ at $300 \ K$? $(R = 0.0821 \ dm^3 \ atm \ K^{-1} \ mol^{-1})$
- A$148 \ g \ mol^{-1}$
- B$160 \ g \ mol^{-1}$
- C$172 \ g \ mol^{-1}$
- D$136 \ g \ mol^{-1}$
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