What is the molar mass of a solute when $2.3 \ g$ of a non-volatile solute is dissolved in $46 \ g$ of benzene at $30^{\circ} C$? (Relative lowering of vapour pressure is $0.06$ and the molar mass of benzene is $78 \ g \ mol^{-1}$)
- A$65 \ g \ mol^{-1}$
- B$80 \ g \ mol^{-1}$
- C$72 \ g \ mol^{-1}$
- D$48 \ g \ mol^{-1}$
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