Chapter 13, Problem 100SCQ

Interpretation Introduction

Interpretation: Among $10.0g$ of sucrose and $10.0g$ of ethylene glycol which has the greater influence on vapor pressure of $1000g$ water is to be identified.

Concept introduction:

Colligative properties: Properties of solutions which having influence on the concentration of the solute in it. Colligative properties are,

• Decrease in the vapor pressure
• Increase in the boiling point
• Decline in the boiling point
• Osmotic pressure

Raoult’s law: In a solution, vapor pressure of solvent is proportional to its mole fraction.

  $P_{solvent}=X_{solvent}{P}^0{}_{solvent}$

  where,

  $P^0{}_{solvent}$ is the vapor pressure of pure solvent.

Molality (m): Molality is the number of moles of solute present in one kilogram of solvent.

  $\text{Molality (m) =}\frac{\text{Number}\text{of}\text{moles}\text{of}\text{solute}}{\text{1kg}\text{of}\text{solvent}}$