$0.6 \ g$ of a solute is dissolved in $0.1 \ L$ of a solvent which develops an osmotic pressure of $1.23 \ atm$ at $27 \ ^\circ C$. The molecular mass of the substance is ........ $g \ mol^{-1}$.
- A$149.5$
- B$120$
- C$430$
- DNone of these
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