What is the molar mass of a solute when $5 \ g$ of solute dissolved in $70 \ g$ of solvent lowers its freezing point by $2.5 \ K$? Given $K_f = 3.5 \ K \ kg \ mol^{-1}$.
- A$100 \ g \ mol^{-1}$
- B$120 \ g \ mol^{-1}$
- C$160 \ g \ mol^{-1}$
- D$140 \ g \ mol^{-1}$
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