The volume change on mixing for the liquid methyl formate(1) + liquid ethanol(2) system at 298.15 K may be approximately represented by J. Polack, Lu, B.C.-Y. 1972. J. Chem Thermodynamics, 4:469:

(a) Using this correlation, and the data V₁ = 67.28 cm³/mol, V₂ = 58.68 cm³/mol, determine the molar volume of mixtures at x₁ = 0, 0.2, 0.4, 0.6, 0.8, 1.0 in cm³/mol.

(b) Analytically differentiate the above expression and show that

and plot these partial molar excess volumes as a function of x₁.

Transcribed Image Text:

ΔΙ mix = 0.8.x₁x₂ cm³/mol