The excess Gibbs energies for liquid argonmethane mixtures have been measured at several temperatures. The results are

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The excess Gibbs energies for liquid argon–methane mixtures have been measured at several temperatures. The results are

yex Ge *Ar(1 - Ar){A - B(1 - 2 Ar)} where numerical values for the parameters are RT T (K) A 109.0 0.3024

Compute the following: 

a. The activity coefficients of argon and methane at 112.0 K and xAr = 0.5 

b. The molar isothermal enthalpy change on producing an xAr = 0.5 mixture from its pure components at 112.0 K

c. The molar isothermal entropy change on producing an xAr = 0.5 mixture from its pure components at 112.0 K

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