Calculate the molar mass of a nonvolatile solute when $1.5 \ g$ of it is dissolved in $90 \ g$ of solvent,decreasing its freezing point by $0.25 \ K$. Given: $K_{f} = 1.2 \ K \ kg \ mol^{-1}$.
- A$72 \ g \ mol^{-1}$
- B$80 \ g \ mol^{-1}$
- C$88 \ g \ mol^{-1}$
- D$96 \ g \ mol^{-1}$
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