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02000CH204052003

The partial molar volume of species 1 in a binary solution at constant temperature
and pressure is given by ‏رلا‎ = 17 + > 32 where a is a constant. Derive the
equation for ಗೈ and the expression for molar volume of the solution.
What are the different criteria for phase equilibrium?
A binary vapour mixture contains 50 mole % A and 50 mole % B at 300 K and
101.3 kPa. This mixture is compressed isothermally to liquify it. The liquid can be
considered as an ideal solution. The vapour pressures of A and B are 140 kPa and
118 kPa respectively. Determine
i). The pressure at which condensation occurs
ii). Composition of liquid formed.
Explain any one method to check the consistency of vapour liquid equilibrium data.
Explain Lewis Randall rule and derive Raoult’s law from it.
With the help of neat sketches explain positive and negative deviations from
ideality. Bring out the characteristics of corresponding azeotropes formed.
2 kg of an azeotropic mixture of A and B with 80 mole % A is partially vapourized
such that 0.6 kg of liquid is converted to vapour. Predict the composition of vapour
formed and the composition of the remaining liquid. Justify the result.
PART C

Answer any two questions. Each question carries 20 marks.
Pure N20, at a low temperature is diluted with air and heated to 298 K and 1 bar.
The following reaction occurs. 1204 (ഇട 21702 (8) If the mole fraction of
N20, in the reaction mixture before dissociation is 0.2, calculate the percentage of
decomposition and equilibrium compositions of N2O4 and NO). The standard free
energy change for the reaction at 298 K is 4644.7 J/mol.
Explain flash vapourization operation and develop the mass balance equations.
Explain how the fraction vapourized can be calculated.
Vapour mixture of components A and B with 60% mole fraction of A is cooled at
constant pressure of 100 kPa. If the components are immiscible in liquid phase,
determine the three phase equilibrium temperature and the vapour phase
composition at this temperature. The vapour pressures of pure components versus

temperature data are given below:

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