CD Page viewA Read aloud V DrawHighlightE) 369 torr19. The vapor pressure curve for a binary solution containing two volatile liquids, A and B, is shown in theFigure below. The curve is in terms of the mole fraction of component A; and P°A and P°B represent thevapor pressures of pure A and B, respectively. How would you classify the solution?500400P°A300200100XXA) ideal, follows Raoult's lawB) nonideal with negative deviation from Raoult's lawC) nonideal with positive deviation from Raoult's law20. What does the Figure in Question #19 say about the intermolecular forces between molecules of A and B?A) The forces between A molecules are similar to the forces between B molecules.B) The attractive forces between A and B molecules are smaller than the attractive forces between AP, torr OCHEM162%20W21%20Quiz4.pdfD Page viewA Read aloud V DrawHighlight200O Erase1000.0.XA1A) ideal, follows Raoult's lawB) nonideal with negative deviation from Raoult's lawC) nonideal with positive deviation from Raoult's law20. What does the Figure in Question #19 say about the intermolecular forces between molecules of A and B?A) The forces between A molecules are similar to the forces between B molecules.B) The attractive forces between A andB molecules are smaller than the attractive forces between Amolecules and other A molecules and/or between B molecules and other B molecules.C) The attractive forces between A andB molecules are greater than the attractive forces between Amolecules and other A molecules and/or between B molecules and other B molecules.D) The forces between A and B molecules are repulsive.E) The Figure doesn't say anything about intermolecular forces.4aP.

Answered: 19. The vapor pressure curve for a…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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CD Page view
A Read aloud V Draw
Highlight
E) 369 torr
19. The vapor pressure curve for a binary solution containing two volatile liquids, A and B, is shown in the
Figure below. The curve is in terms of the mole fraction of component A; and P°A and P°B represent the
vapor pressures of pure A and B, respectively. How would you classify the solution?
500
400
P°A
300
200
100
XX
A) ideal, follows Raoult's law
B) nonideal with negative deviation from Raoult's law
C) nonideal with positive deviation from Raoult's law
20. What does the Figure in Question #19 say about the intermolecular forces between molecules of A and B?
A) The forces between A molecules are similar to the forces between B molecules.
B) The attractive forces between A and B molecules are smaller than the attractive forces between A
P, torr

OCHEM162%20W21%20Quiz4.pdf
D Page view
A Read aloud V Draw
Highlight
200
O Erase
100
0.
0.
XA
1
A) ideal, follows Raoult's law
B) nonideal with negative deviation from Raoult's law
C) nonideal with positive deviation from Raoult's law
20. What does the Figure in Question #19 say about the intermolecular forces between molecules of A and B?
A) The forces between A molecules are similar to the forces between B molecules.
B) The attractive forces between A andB molecules are smaller than the attractive forces between A
molecules and other A molecules and/or between B molecules and other B molecules.
C) The attractive forces between A andB molecules are greater than the attractive forces between A
molecules and other A molecules and/or between B molecules and other B molecules.
D) The forces between A and B molecules are repulsive.
E) The Figure doesn't say anything about intermolecular forces.
4
a
P.

Expert Solution

Step 1

Ideal solution

The Solutions obeying Raoult's law at all compositions of solute in the solvent at every temperature

$∆ H_{m i x} = ∆ V_{m i x} = 0 f o r a n i d e a l s o l u t i o n$

Ideal solutions are formed when two components of identical molecular structure , properties and same intermolecular forces are mixed

Non Ideal solutions

The real solutions that deviate from Raoult's law are non ideal solutions . They show negative or positive deviations from ideality .

For positive deviation :

${(\frac{\partial \ln (\frac{\bar{f_{i}}}{f_{i}})}{\partial T})}_{p} < 0$

In positive deviation , the boiling point of the solutions formed tend to be les than the actual value

Ex: Acetone - Benzene

For negative deviation :

For such solutions the partial pressures are less than the one obtained from Raoults law .In negative deviation from ideality there is always evolution of heat wherein in positive deviation there is absorption of heat during mixing . Negative deviation exhibit stronger intermolecular forces of attraction between the unlike molecules than the like .

Ex: Water - HCl

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