What is the exam pattern and passing mark for GTU Chemical Engineering Thermodynamics - II (BE04005041)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

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Gujarat Technological UniversitySummer 2026 examination

GTU BE04005041 Chemical Engineering Thermodynamics - II Summer 2026 Question Paper & PDF

B.E. · Chemical Engineering · Semester 4 · Subject code BE04005041

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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

State and explain Duhemn Theorem

(b)

4 marks

Define azeotrope and explain maximum and minimum boiling azeotrope with a neat diagram.

(c)

7 marks

Mixtures of n-Heptane (A) and n-Octane (B) are expected to behave as an ideal solution. The total pressure over the system is 101.3 kPa Using vapor pressure data given below Construct T-x,y diagram.

T,K	371.4	378	383	388	393	398.6
$\text{P}_\text{A}$ ,kPa	101.3	125.3	140.0	160.0	179.9	205.3
$\text{P}_\text{B}$ , kPa	44.4	55.6	64.5	74.8	86.6	101.3

Q.2

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

In the laboratory of mass transfer, will it be possible to prepare $0.12\text{m}^3$ of alcohol-water solution by mixing $0.04\text{m}^3$ alcohol with $0.08\text{m}^3$ pure water? If not possible, Assess the volume which should have been mixed in order to prepare a mixture of the same strength and of the required volume? Density of ethanol and water are $789\text{kg/m}^3$ and $997\text{kg/m}^3$ respectively. Data: The partial molar volumes of ethanol and water at the desired compositions are: $\text{Ethanol} = 53.6*10^{-6}\text{m}^3\text{/mol}$ ; $\text{Water} = 18*10^{-6}\text{m}^3\text{/mol}$ .

(c)

7 marks

Assuming Raoult’s law to be valid for the system Benzene (1)–Ethyl benzene (2) and the vapour pressures are given by the Antoine equation:

\ln \text{P}_\text{i}^{\text{ sat}} = \left[ \text{A} - \left( \dfrac{\text{B}}{\text{T}+\text{C}} \right) \right]\text{, where P is in kPa and T is in K.}

Construct the T-x-y diagram at 101.33 kPa.

Species, i	A	B	C
1	13.8858	2788.51	-52.41
2	14.0045	3279.47	-60.00

Q.3

14 Marks

(a)

3 marks

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

(b)

4 marks

Write a brief note on Ideal solutions

(c)

7 marks

Estimate the fugacity of iso-butane at 15 atm. and

87^\circ\text{C}

using the compressibility factor correlation Z= 1+ (BP/RT), given that the second virial coefficient

\text{B} = - 4.28 *10^{-4}\text{ m}^3\text{/mol}

(a)

3 marks

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

(b)

4 marks

Write steps to determine Bubble point temperature using Raoult’s Law.

(c)

7 marks

The azeotrope of the Ethanol-benzene system has a composition of 44.8 mole percent ethanol with a boiling point of

68.2^\circ\text{C}

at 760 mmHg. At

68.2^\circ\text{C}

, the vapor pressure of pure benzene is 517 mmHg and that of ethanol is 506 mmHg. Calculate the Margules constants for the system and determine the activity coefficients for a solution containing 20 mole percent ethanol

Q.4

14 Marks

(a)

3 marks

State applications and limitations of Wilson and NRTL equation.

(b)

4 marks

Explain Liquid-Liquid Equilibrium with suitable example.

(c)

7 marks

Assuming the validity of Raoult’s law, Compute for the system of Benzene (1), and Toluene (2) Given $\text{y}_1 = 0.40$ and $\text{t}= 80^\circ\text{C}$ , find $\text{x}_1$ , $\text{x}_2$ and P. Data: $\text{At}= 80^\circ\text{C}$ , $\text{P}_1\text{sat} =101.05\text{ kPa}$ $\text{P}_2\text{sat} =38.83\text{kPa}$ .

(a)

3 marks

Define equilibrium constant K of a chemical reaction. How is it related to

\text{K}_\text{f}

and

\text{K}_\text{p}

(b)

4 marks

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

(c)

7 marks

Using the fundamental properties relation for single phase reaction, show that

\Delta \text{G}^0 = - \text{RT } \ln \text{K}

Q.5

14 Marks

(a)

3 marks

Describe phase rule for reacting systems

(b)

4 marks

What is the effect of temperature on equilibrium constant? Using Van’t Hoff equation predict the effect of increasing temperature on endothermic and exothermic reactions.

(c)

7 marks

Consider a system in which the following reactions occur:

$\text{CH}_4+ \text{H}_2\text{O} \to \text{CO}+3\text{H}_2 \dots\dots\dots\dots (1)$

$\text{CH}_4 + 2\text{H}_2\text{O} \to \text{CO}_2 +4\text{H}_2 \dots\dots (2)$

If  $2\text{mol CH}_4$  and  $3\text{mol H}_2\text{O}$  are initially present, Compute the mole fraction of the product gases for  $\varepsilon_1= 0.5$  and  $\varepsilon_2=0.5$

(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

The water–gas shift reaction takes place at $373\text{K}$ ,

$\text{CO} + \text{H}_2\text{O} \to \text{CO}_2 +\text{H}_2$

The equilibrium constant  $\text{K}_P$  for this reaction at  $537\text{K} = 9.8 \times 10^{-4}$ . The heats of formation at  $298\text{K}$  are:  $\text{CO} = -110{,}525\text{J/mol}$ ,  $\text{CO}_2 = -393{,}509\text{ J/mol}$ ,  $\text{H}_2\text{O}= -241{,}818\text{ J/mol}$ . Calculate the equilibrium constant at  $1000\text{ K}$ .

(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.

$\text{CO}_{(\text{g})} +\text{H}_2\text{O}_{(\text{g})} \to \text{CO}_{2(\text{g})} + \text{H}_{2(\text{g})}$

iThe reactants consist of

1\text{mol}

of water vapour and

1\text{mol}

of carbon monoxide. The equilibrium constant

\text{K}= 1

for the reaction at temperature of

1100\text{ K}

and the pressure of 1 bar.

iiSame as (i) except that

4\text{ mol of N}_2

is included in the reactants.

Other Semester 4 subjects

BE Chemical

3140503

Heat Transfer

3140507

Chemical Engineering Thermodynamics II

3140508

Unit Processes & Chemical Technology

3140509

Pollution control & safety Management

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About this paper

Official Gujarat Technological University (GTU) examination paper for Chemical Engineering Thermodynamics - II (Summer 2026, 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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