Chapter 16, Problem 9STP

Interpretation Introduction

Interpretation : The lowest boiling point is to be identified.

Concept Introduction : Colligative properties are those of solutions that depend only on the number of solute particles present, not on the nature of those particles. Depression in freezing point, elevation in boiling point, and vapor pressure lowering are important colligative properties.

Answer to Problem 9STP

The atomic window B will have the lowest boiling point.

Explanation of Solution

The boiling-point elevation is the temperature difference between a solution's boiling point and the boiling point of a pure solvent.

The likelihood of water turning into vapor is decreased by the solute due to the solution's vapor pressure being lowered.

To boil off the liquid water molecules, more kinetic energy will be needed.

The atomic window A contains more solute particles along with water (solvent).

The atomic window B contains only water (solvent) without any solute particles.

The atomic window C contains fewer solute particles along with water (solvent).

Among the atomic windows, B will have a lower boiling point since there is only solvent present in it.

The atomic window A will highest boiling point due to the presence of more solute particles.