“Amount of NaBr in grams must be added to 25 0 g of water to lower the vapour pressure” should be calculated. Concept introduction: The moles of solute per kilogram of solvent is known as molality of the solution. Colligative properties of ideal or dilute solutions are depending upon the number of solute particles. Relative lowering in vapour pressure is a colligative property, which is proportional to the molal concentration of the solution. Given: Solvent = 250 g H 2 O at 40 C o Vapour pressure lowering= 1.30 mmHg Vapor pressure of water at 40 C o = 55 . 3 mmHg

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Chapter 12, Problem 12.15P

Interpretation Introduction

Interpretation:

“Amount of NaBr in grams must be added to 250 g of water to lower the vapour pressure” should be calculated.

Concept introduction:

The moles of solute per kilogram of solvent is known as molality of the solution.
Colligative properties of ideal or dilute solutions are depending upon the number of solute particles.
Relative lowering in vapour pressure is a colligative property, which is proportional to the molal concentration of the solution.

Given:

Solvent = 250 g H2O at 40Co

Vapour pressure lowering= 1.30 mmHg
Vapor pressure of water at 40Co = 55.3 mmHg

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