Question

PAKI T UIJJ 5.9 Plot the vapour pressure data for a mixture of benzene (B) and acetic acid (A) given below and plot the vapour pressure/composition curve for the mixture at 50°C. Then confirm that Raoult's and Henry's laws are obeyed in the appropriate regions. Deduce the activities and activity coefficients of the components on the Raoult's law basis and then, taking B as the solute, its activity and activity coefficient on a Henry's law basis. Finally, evaluate the excess Gibbs energy of the mixture over the composition range spanned by the data. x 0.0160 0.0439 0.0835 0.1138 0.1714 0.484 0.967 1.535 1.535 1.89 2.45 PR/kPa 35.05 35.05 34.29 34.29 3 3.28 32.64 30.90 0.2973 0.3696 0.5834 0.6604 0.8437 0.9931 Pa/kPa 3.31 3.83 4.84 5.36 6.76 7.29 Pg/kPa 28.16 26.08 20.42 18.01 10.0 0.47 5.10+ Aminabhavi et al. examined mixtures of cyclohexane with various long- In tara and PA/kPa the

Answer 1

Sol: Plot Of Vapour poessuse Vs Composition at 50°C (Benzene Vs Acetic acid) 351 T=50°c. Racuit's Law viation from Possitive - activity Co-efficient from (odxd Raoult's Law. deviation Raoult's law Negative Benzene (mol %) acetic aud Acc to Raouts Lao, PA=TAPA Pn Solute XA - Mole fraction Po Pure Solute

And accosding to thenoy's Laco, at a constant Temperature, - The Solubility (G) of a gas in a liquid is didectly poopootion to the Poessure (Ⓡ) of the gas. P=kus Region Where law KH Raoults is obeyed Pressure Hendy's Low Raoult's Law Benzene This acetic acid region where Henry's Law is obeyed.

→ Coefficient Activity Co-efficient On the Raoult's Law IP = Sex,p, + Vital a activity Possitive deviation 1; >, Negative deviation Up <1 activity a; = 1; . X; Excess Gribbs Energy 1, S; G: G (8314 J, moi), *') * (323x) In V;. RT