Given that the vapour pressure of ethanol at 20°C is 44 mmHg and the vapour pressure of methano! at the same temperature is 94 mmHg. For a mixture of 30.0g of methanol and 45.0g of ethanol. i) Calculate the mole fraction of methano! and ethanol vapour for the solution at 20°C Calculate the vapour pressure of methanol and ethanol in the vapour above this solution at 20°C

Given that the vapour pressure of ethanol at 20°C is 44 mmHg and the vapour pressure of methano! at the same temperature is 94 mmHg. For a mixture of 30.0g of methanol and 45.0g of ethanol. i) Calculate the mole fraction of methano! and ethanol vapour for the solution at 20°C Calculate the vapour pressure of methanol and ethanol in the vapour above this solution at 20°C

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.84QE

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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

Question (i) and (ii)

A mixture of ethanol (C,H5OH, b.p. 78.5°C) and methanol (CH3OH, b.p.64.5°C) obey
Raoult's Law closely while a mixture of trichloromethane (CHCI3, b.p. 61.8°C) and ether
(C2H5OC2H5; b.p. 34.6°C) show a negative deviation.

Given that the vapour pressure of ethanol at 20°C is 44 mmHg and the vapour
pressure of methano! at the same temperature is 94 mmHg. For a mixture of 30.0g
of methanol and 45.0g of ethanol.
i)
Calculate the mole fraction of methano! and ethanol vapour for the solution
at 20°C
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ii)
Calculate the vapour pressure of methanol and ethanol in the vapour above
this solution at 20°C
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