The excess Gibbs energies for liquid argon-methane mixtures have been measured at several temperatures [A. G. Duncan and M. J. Hiza, I.E.C. Fundam. 11, 38 (1972)]. The results are =XAr (1-Xar){A-B(1-2xAr)}, RT where numerical values for the parameters are given as: T(K) 109.0 112.0 115.75 A 0.3024 0.2929 0.2792 B -0.01453 -0.01169 +0.05115 Compute the following: a) The activity coefficients of argon and methane at 112.0 K and XAr = 0.50. b) The molar isothermal enthalpy and entropy changes on producing an XA = 0.5 mixture from its pure components at 112.0 K.

Introduction to Chemical Engineering Thermodynamics
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Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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The excess Gibbs energies for liquid argon-methane mixtures have been measured at several temperatures
[A. G. Duncan and M. J. Hiza, I.E.C. Fundam. 11, 38 (1972)]. The results are
=XAr (1-Xar){A-B(1-2xAr)},
RT
where numerical values for the parameters are given as:
T(K)
109.0
112.0
115.75
A
0.3024
0.2929
0.2792
B
-0.01453
-0.01169
+0.05115
Compute the following:
a) The activity coefficients of argon and methane at 112.0 K and XAr = 0.50.
b) The molar isothermal enthalpy and entropy changes on producing an XA = 0.5 mixture from its pure
components at 112.0 K.
Transcribed Image Text:The excess Gibbs energies for liquid argon-methane mixtures have been measured at several temperatures [A. G. Duncan and M. J. Hiza, I.E.C. Fundam. 11, 38 (1972)]. The results are =XAr (1-Xar){A-B(1-2xAr)}, RT where numerical values for the parameters are given as: T(K) 109.0 112.0 115.75 A 0.3024 0.2929 0.2792 B -0.01453 -0.01169 +0.05115 Compute the following: a) The activity coefficients of argon and methane at 112.0 K and XAr = 0.50. b) The molar isothermal enthalpy and entropy changes on producing an XA = 0.5 mixture from its pure components at 112.0 K.
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