Calculate the molar mass of a solute when $4 \ g$ of it is dissolved in $1 \ dm^3$ of solvent,having an osmotic pressure of $2 \ atm$ at $300 \ K$. $[R = 0.082 \ dm^3 \ atm \ K^{-1} \ mol^{-1}]$
- A$49.2 \ g \ mol^{-1}$
- B$44.5 \ g \ mol^{-1}$
- C$54.2 \ g \ mol^{-1}$
- D$56.4 \ g \ mol^{-1}$
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