Gujarat Technological UniversitySummer 2025 examination

GTU 3140507 Chemical Engineering Thermodynamics II Summer 2025 Question Paper & PDF

B.E. · Chemical Engineering · Semester 4 · Subject code 3140507
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Define fugacity, fugacity co efficient, and activity
(b)
4 marks

Derive the equation for determination of fugacity of pure gases using any two methods.

(c)
7 marks

For a system in which the following reaction occurs, Assume there are present initially 2mol of CH4, 1mol of H2O, 0.5mol of CO, and 3.5mol of H2. Determine an expression for the mole fraction yi as function of εe

Q.2

14 Marks
(a)
3 marks
Write a brief note on Ideal solutions
(b)
4 marks
Define azeotrope and explain maximum boiling azeotrope with a neat diagram.
(c)
7 marks
Estimate activity coefficient of methanol for chloroform
1)/ methanol
2)system at 35°C. The vapour pressures of chloroform and methanol at 35°C are 39.54kPa and 27.95kPa respectively, when the mole fraction of methanol in the liquid mixture is 0.4. Margules’ parameters are A12 = 0.738, A21 = 1.868.
(c)
1 mark

The fugacity of component 1 in binary liquid mixture of components 1 and 2 at 298 K and 20 bar is given by where is in bar and 1 is the mole fraction of component 1. Determine:

i)The fugacity f1 of pure component1 Mark
ii)The fugacity coefficient
iii)The Henry’s law constant K1
iv)The activity coefficient ϒ1.

Q.3

14 Marks
(a)
3 marks
Discuss the criteria of phase equilibrium for a homogeneous closed system.
(b)
4 marks

What is partial molar property? Discuss the physical significance and importance of partial molar property.

(c)
7 marks
The molar volume of a binary solution at 300 K and 1 bar is given by:

V = 500 1 + 1000 2 + 1 2(50 1 + 40

2)cm3/mol For the stated temperature and pressure, determine:
i)Expressions for and in terms of x1
ii)Numerical values for the partial molar volumes at infinite dilution and
(a)
3 marks

What is retrograde condensation and explain its application in chemical industry.

(b)
4 marks
State applications and limitations of Wilson and NRTL equation.
(c)
7 marks
The vapour pressures of acetone
1)and acetonitrile
2)can be evaluated by the Antoine equations Where T is in K and P is in kPa. Assuming that the solutions formed by these are ideal, calculate x1, and y1 at 327 K and 65 kPa

Q.4

14 Marks
(a)
3 marks

Determine the fugacity and fugacity coefficient of steam at 623 K and 1000 kPa using enthalpy and entropy values from steam tables. Assume that steam behaves ideally at 101.3 kPa and 623K, H = 3176 kJ/kg; S = 8.38 kJ/kg K. Data from steam tables: At 1000kPa and 623K, H = 3159 kJ/kg; S = 7.3 kJ/kg K.

(b)
4 marks

The Henry’s law constant for oxygen in water at 298 K is 4.4*10 4bar. Estimate the solubility of oxygen in water at 298 K for a partial pressure of oxygen at 0.25 bar.

(c)
7 marks
Write steps to determine Bubble point temperature using Raoult’s Law.
(a)
3 marks

What do you mean by the ‘extent of reaction’? How is it related to the mole fraction of the species in the reaction mixture?

(b)
4 marks
Discuss any one group contribution method to determine activity coefficients
(c)
7 marks

The water-gas-shift reaction is carried out under the different sets of conditions described below. Calculate the fraction of steam reacted in each case. Assume the mixture behaving as an ideal gas.

i)The reactants consist of 1mol of water vapour and 1mol of carbon monoxide. The equilibrium constant K= 1 for the reaction at temperature of 1100 K and the pressure of 1 bar.
ii)Same as
i)except that 3 mol of N2 is included in the reactants.
iii)The reactants are 2 mol of CO and 1 mol of H2O; other conditions are the same as in
i).

Q.5

14 Marks
(a)
3 marks
Describe phase rule for reacting systems
(b)
4 marks

Explain any one method for checking the consistency of experimental VLE data.

(c)
7 marks
Explain how the equilibrium constant for liquid reaction is evaluated.
(a)
3 marks

Calculate the equilibrium constant at 298K of the reaction Given that the standard free energies of formation at 298K are 97,540 J/mol for N2O4 and 51,310 J/mol for NO2.

(b)
4 marks
Explain effect of temperature and pressure on equilibrium constant.
(c)
7 marks

Using the fundamental properties relation for single phase reaction, show that ∆G0 = – RT lnK

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Official Gujarat Technological University (GTU) examination paper for Chemical Engineering Thermodynamics II (Summer 2025, B.E. · Chemical Engineering, Sem 4). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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