Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 5th Sem 2150503 Chemical Engineering Thermodynamics Ii Previous Question Paper

Enrolment No.___________

**GUJARAT TECHNOLOGICAL UNIVERSITY**

**BE - SEMESTER? V EXAMINATION ? SUMMER 2020**

**Subject Code: 2150503**

**Date:29/10/2020**

**Subject Name: CHEMICAL ENGINEERING THERMODYNAMICS - II**

**Time: 02:30 PM TO 05:00 PM**

**Total Marks: 70**

**Instructions:**

**1. Attempt all questions.**

**2. Make suitable assumptions wherever necessary.**

**3. Figures to the right indicate full marks.**

**MARKS**

**Q.1 (a)**What are the characteristics of an ideal solution ?

**03**

**(b)**Discuss any two methods to determine fugacity of pure gases.

**04**

**(c)**Answer the followings:

**07**

1 What do you mean by activity of pure fluid? How would you

02

estimate activity of an incompressible fluid?

2 How activity coefficient is related to the molar Excess Gibbs

01

free energy in solution ?

3 Why does the boiling point diagram at high pressures lie above

01

that at a lower pressure?

4 What do you mean by "extent of reaction "?

01

5 What is the degree of freedom for the following non ?reactive

01

equilibrium system?

Two partially miscible liquid phases are in equilibrium with

vapor phase.

6 How would you predict the feasibility of reaction from the value 01

of the standard free energy change?

**Q.2 (a)**Discuss effect of increasing pressure on T-x-y diagram in brief.

**03**

**(b)**Discuss Lewis-Randall rule, clearly mentioning its limitations.

**04**

**(c)**Define "Partial Molar property". Describe different methods to

**07**

determine partial molar properties in detail.

**OR**

**(c)**Derive the equation for the criteria for phase equilibrium in terms

**07**

of fugacity for mixture of N components and phases

**Q.3 (a)**Discuss any two methods to check consistency of experimental

**03**

VLE data in detail.

**(b)**Discuss effect of temperature and pressure on chemical potential.

**04**

**(c)**Prove that if Henry's law is obeyed by component 1 in a binary

**07**

solution over certain concentration range, Lewis-Randall rule

will be obeyed by component 2 over the same concentration

range.

**OR**

**Q.3 (a)**Discuss excess Gibbs free energy in brief.

**03**

**(b)**Discuss effect of temperature and pressure on equilibrium

**04**

constant.

**(c)**Discuss van Laar and Margulies Equations in detail.

**07**

**Q.4 (a)**Discuss phase rule for non reacting systems in brief.

**03**

1

**(b)**Derive equations for flash calculations.

**04**

**(c)**The vapour pressures of acetone(1) and acetonitrile (2) can be

**07**

evaluated by the following Antoine equations, where P is in

kPa and T is in K.

2940.46

1 = 14.5463 -

- 35.93

2945.47

2 = 14.2724 - - 49.15

Assuming ideal solutions, calculate

**1)**1 and 1 at 327 K and 65 kPa

**2)**T and y1 at 65 kPa and

x1= 0.4

**3)**P and 1 at 327 K and 1 = 0.4

**OR**

**Q.4 (a)**Discuss Duhem's Theorem briefly.

**03**

**(b)**Write short note on VLE for completely immiscible systems with

**04**

neat diagram.

**(c)**The partial molar volumes of acetone and chloroform in a

**07**

mixture in which mole fraction of acetone is 0.5307 are 74.166?

10 ? 6 m3/mol and 80.235 ? 10 ? 6 m3/mol respectively. What is

the volume of 1 kg of the solution?

**Q.5 (a)**Discuss effect of presence of Excess of reactants and products on

**03**

equilibrium conversion.

**(b)**Wilson's parameters 12 and 21 for the system nitromethane (1)

**04**

and carbon tetrachloride(2) at 45 are 0.1156 and 0.2879

respectively. Calculate the activity coefficients of the

components in a solution containing 30 mol % nitromethane.

**(c)**Derive equation for standard heat of reaction.

**07**

**OR**

**Q.5 (a)**Discuss Heterogeneous reaction equilibria with reference to

**03**

"reactions in solutions".

**(b)**Calculate the fugacity of pure ethylene at 100 bar and 373 K.The

**04**

van der Waals constants are a = 0.453 J m3/mol2 and b = 0.571

? 10-4 m3/mol and molar volume at 100 bar and 373 K = 2.072

? 10-4 m3/mol.

**(c)**Discuss minimum and maximum boiling azeotropes with neat

**07**

sketch.

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This post was last modified on 04 March 2021