Situation:
Normally, binary mixtures with components in the same homologous series are nearly ideal. In
2009, a group at the National Chung Hsing University in Taiwan published data and calculations of
activity coefficients for such systems in two papersā .
Requirements:
Please, choose, in either paper, a system with components in the same homologous series and use
that in questions (b) through (d); question (a) is general. Then do the following:
(a) Derive and explain eqn. 5 of paper 1 (which is also eqn. 2 in paper 2). (8 points)
(b) Calculate the temperature, in [K], at which the average vapor pressure of the two
components is 0.4 [MPa]. Round off to the nearest multiple of 10 [K]. (7 points)
(c) Estimate $G^E$ for an equimolar solution at the temperature found in (b) based on the values of
$G^E$ at 333.15 [K] and 353.15 [K] as shown in Fig. 7 in either paper. (7.5 points)
(d) Generate a $P$-$x$-$y$ plot at the temperature found in (b). Use double-suffix Margules for the
liquid phase and virial equation and ideal solution for the vapor phase. (12.5 points)
(e) Repeat (d) not assuming ideal solution in the vapor phase. (15 points)
ā Papers uploaded as:
1. Lee-2009-FPE-280-42-IsoT-VLE-ExcessG-Benzene-Toluene-Xylene-Methylformamide.pdf
2. Lee-2009-JTaiwanInstChE-40-573-IsoT-VLE-ExcessG-Hexane-Heptane-Octane-Nonane-Cyclohexane.pdf
