The data for the liquid-vapour pressure equilibrium composition of mixtures of nitrogen and oxygen at 100 kPa has to be plotted on a temperature-composition diagram. The extent to which it fits the prediction for ideal solution has to be determined by calculating the activities coefficients of O 2 at each composition. Concept introduction: The activity coefficients for liquid-vapor pressure equilibrium can be calculated on the basis of Raoult’s law. The Raoult’s law states that the ratio of the partial pressure of each component to the partial pressure in the vapour pressure when it is present as a pure liquid is equal to its composition in the liquid phase. The activity is directly proportional to the total pressure of the mixture and the mole fraction of the component.

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Chapter 5, Problem 5.4IA

Interpretation Introduction

Interpretation:

The data for the liquid-vapour pressure equilibrium composition of mixtures of nitrogen and oxygen at 100 kPa has to be plotted on a temperature-composition diagram. The extent to which it fits the prediction for ideal solution has to be determined by calculating the activities coefficients of O2 at each composition.

Concept introduction:

The activity coefficients for liquid-vapor pressure equilibrium can be calculated on the basis of Raoult’s law. The Raoult’s law states that the ratio of the partial pressure of each component to the partial pressure in the vapour pressure when it is present as a pure liquid is equal to its composition in the liquid phase. The activity is directly proportional to the total pressure of the mixture and the mole fraction of the component.

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