Feedback - Q1Most of you managed this well once you realised that for Henry’s Law, the temperature should be approximated as the boiling temperature of the bulk component. This allowed the pure component vapour pressure of the dilute component to be evaluated.For the comparison with the x-y diagram, the determination of the initial gradient was approximate, but the value you found should certainly have corresponded more closely to the non-ideal Henry’s Law constant. This comment applies both to part (a) and part (b).Answer to Q1: a) (i) 3.48 atm; (ii) 7.21 atm, b) (i) 0.242 atm; (ii) 0.449 atmPART 1a) (ii) PLEASE STEPS ON HOW TO REACH ANSWER Activity coefficients are a function of composition (butonly weak dependence on T and P, which we'll ignore)We use an empirical approach to determine y; usingMargules equation:In y¡ = x² (A¡¡ + 2x; (A¡¡ — AjA₁j and Aji are Margules coefficients for the binarymixture of i and jMargules coefficients can be found in tables in textbooksor can be found by matching VLE calculations toexperimental dataThere are of course many alternatives to Antoine's eqnand Margules equation Data:Antoine coefficients (P in mmHg, Tin K, log to base e):Margules parameters:1. a) Calculate the Henry's Law constant for dilute methanol in water at 1 atmosphere:i) assuming ideal solution behaviour;using the Margules Coefficients provided to account for the non-ideality of the solution.Compare your answers with the value roughly obtained from the gradient in the x-y diagram below.Ym (molefraction of methanol in vapour)Methanol: A = 18.588, B = 3626.6, C = -34.29Water: A = 18.304, B = 3816.4, C = -46.13Ethanol: A = 18.9119, B = 3803.98, C = -41.68b) Now repeat part a) but this time to determine the Henry's Law constant for dilute water inmethanol at p=1 atm. Again, compare your results to the constant roughly obtained from the x-ydiagram.0.80.6Methanol-Water: Awm = 0.6174, Amw = 0.7279Ethanol-Water: Awe = 0.7917, Aew = 1.63660.40.2x-y diagram for methanol/water at 1 atm0.20.60.4Xm (molefraction of methanol in liquid)0.8

To calculate the Henry's Law constant for dilute methanol in water at 1 atmosphere, we can use the…

Answered: Data: Antoine coefficients (P in mmHg,…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Feedback - Q1 Most of you managed this well once you realised that for Henry’s Law, the temperature should be approximated as the boiling temperature of the bulk component. This allowed the pure component vapour pressure of the dilute component to be evaluated. For the comparison with the x-y diagram, the determination of the initial gradient was approximate, but the value you found should certainly have corresponded more closely to the non-ideal Henry’s Law constant. This comment applies both to part (a) and part (b). Answer to Q1: a) (i) 3.48 atm; (ii) 7.21 atm, b) (i) 0.242 atm; (ii) 0.449 atm PART 1a) (ii) PLEASE STEPS ON HOW TO REACH ANSWER

Activity coefficients are a function of composition (but
only weak dependence on T and P, which we'll ignore)
We use an empirical approach to determine y; using
Margules equation:
In y¡ = x² (A¡¡ + 2x; (A¡¡ — Aj
A₁j and Aji are Margules coefficients for the binary
mixture of i and j
Margules coefficients can be found in tables in textbooks
or can be found by matching VLE calculations to
experimental data
There are of course many alternatives to Antoine's eqn
and Margules equation

Data:
Antoine coefficients (P in mmHg, Tin K, log to base e):
Margules parameters:
1. a) Calculate the Henry's Law constant for dilute methanol in water at 1 atmosphere:
i) assuming ideal solution behaviour;
using the Margules Coefficients provided to account for the non-ideality of the solution.
Compare your answers with the value roughly obtained from the gradient in the x-y diagram below.
Ym (molefraction of methanol in vapour)
Methanol: A = 18.588, B = 3626.6, C = -34.29
Water: A = 18.304, B = 3816.4, C = -46.13
Ethanol: A = 18.9119, B = 3803.98, C = -41.68
b) Now repeat part a) but this time to determine the Henry's Law constant for dilute water in
methanol at p=1 atm. Again, compare your results to the constant roughly obtained from the x-y
diagram.
0.8
0.6
Methanol-Water: Awm = 0.6174, Amw = 0.7279
Ethanol-Water: Awe = 0.7917, Aew = 1.6366
0.4
0.2
x-y diagram for methanol/water at 1 atm
0.2
0.6
0.4
Xm (molefraction of methanol in liquid)
0.8

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