Calculate the molar mass of a non-volatile solute when $1 \ g$ of it is dissolved in $100 \ g$ of solvent,which decreases its freezing point by $0.2 \ K$. Given: $K_{f} = 1.2 \ K \ kg \ mol^{-1}$.
- A$55 \ g \ mol^{-1}$
- B$60 \ g \ mol^{-1}$
- C$65 \ g \ mol^{-1}$
- D$70 \ g \ mol^{-1}$
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