The excess Gibbs energy for liquid argon-methane mixtures have been measured at

Question

The excess Gibbs energy for liquid argon-methane mixtures have been measured at several temperatures. The results are gE/(RT) = xAr(1 ? xAr[A + B(1 ? 2xAr)]
where numerical values for the parameters are given as T(K) = 109.0, A = 0.3024, B = -0.01453 T(K) = 112.0, A = 0.2929, B = -0.01169 T(K) = 115.75, A = 0.2792, B = +0.05115
Compute the following: 1. The activity coefficients of argon and methane at 112.0 K and xAr = 0.5. 2. The molar isothermal enthalpy change on producing an xAr = 0.5 mixture from its pure components at 112.0 K. 3. The molar isothermal entropy change in producing an xAr = 0.5 mixture from its pure components at 112.0 K.

Explanation / Answer

The excess Gibbs energy for liquid argon-methane mixtures have been measured at

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