Plots of vapor pressure vs. temperature for a solvent and a solution are shown in the graph below.

If 1.00 mol of solute dissolved in 1.00 kg of solvent raises its boiling point by 2.55°C, determine the approximate concentration of the solution in mol/kg.

• A. 3.92 mol/kg
• B. 2.59 mol/kg
• C. 4.12 mol/kg
• D. 3.13 mol/kg

Answer: (A)