$A$ solution of a nonvolatile solute is obtained by dissolving $3.5 \ g$ of solute in $100 \ g$ of solvent. The boiling point elevation is $0.35 \ K$. Calculate the molar mass of the solute. $(K_b = 2.5 \ K \ kg \ mol^{-1})$
- A$270 \ g \ mol^{-1}$
- B$260 \ g \ mol^{-1}$
- C$250 \ g \ mol^{-1}$
- D$240 \ g \ mol^{-1}$
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