Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem Old 150503 Chemical Engineering Thermodynamics Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
Subject Code:150503 Date:31/05/2019
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.
Q.1 (a) Define thermodynamic equilibrium. Explain chemical potential as criteria for phase
equilibrium.
07
(b) Define partial molar property. Derive summability relation and Gibbs/Duhem equation.
07
Q.2 (a) With neat sketch describe phase diagrams for partially miscible systems.
07
(b) Describe the effect of temperature and pressure on fugacity. 07
OR
(b) Explain the phenomena of retrograde condensation.
07
Q.3 (a) Explain block diagram for bubble point temperature calculation.
07
(b) The enthalpy of a binary liquid system of species 1 and 2 at fixed T and P is represented
by the equation:
? ?
1 2 1 2 1 2
H = 400x + 600x + x x 40x + 20x
Determine the expressions for
1
H and
2
H as a function of x1. Calculate the values of
12
1 2 ,
H , H H and H
??
07
OR
Q.3 (a) Define azeotrope. What kind of azeotrope is a system likely to form if it exhibits large positive
deviation from Raoult?s law? Explain.
07
(b) For the system methanol and methyl acetate, the following equation provide reasonable
correlation for activity coefficient
22
1 2 2 1
12
ln ln
2.771-0.00523
3643.31 2665.54
ln 16.591- ln 14.253-
-33.424 -53.424
sat sat
Ax Ax
AT
P and P
TT
?? ??
?
??
where T in K and vapor pressures are in kPa. Assuming the validity of modified Raoults
law , calculate P and yi for T = 318.15 K and x1 = 0.25.
07
Q.4 (a) At 25
0
C the density of a methanol (1) ? water (2) solution at x1 = 0.7779 is 825.959
kg/m
3
. Partial molar volume of water in this solution is 15.686 x 10
-6
m
3
/mol. Determine
the partial molar volume of methanol in the solution.
07
(b) Derive phase rule for reacting system.
07
OR
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
Subject Code:150503 Date:31/05/2019
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.
Q.1 (a) Define thermodynamic equilibrium. Explain chemical potential as criteria for phase
equilibrium.
07
(b) Define partial molar property. Derive summability relation and Gibbs/Duhem equation.
07
Q.2 (a) With neat sketch describe phase diagrams for partially miscible systems.
07
(b) Describe the effect of temperature and pressure on fugacity. 07
OR
(b) Explain the phenomena of retrograde condensation.
07
Q.3 (a) Explain block diagram for bubble point temperature calculation.
07
(b) The enthalpy of a binary liquid system of species 1 and 2 at fixed T and P is represented
by the equation:
? ?
1 2 1 2 1 2
H = 400x + 600x + x x 40x + 20x
Determine the expressions for
1
H and
2
H as a function of x1. Calculate the values of
12
1 2 ,
H , H H and H
??
07
OR
Q.3 (a) Define azeotrope. What kind of azeotrope is a system likely to form if it exhibits large positive
deviation from Raoult?s law? Explain.
07
(b) For the system methanol and methyl acetate, the following equation provide reasonable
correlation for activity coefficient
22
1 2 2 1
12
ln ln
2.771-0.00523
3643.31 2665.54
ln 16.591- ln 14.253-
-33.424 -53.424
sat sat
Ax Ax
AT
P and P
TT
?? ??
?
??
where T in K and vapor pressures are in kPa. Assuming the validity of modified Raoults
law , calculate P and yi for T = 318.15 K and x1 = 0.25.
07
Q.4 (a) At 25
0
C the density of a methanol (1) ? water (2) solution at x1 = 0.7779 is 825.959
kg/m
3
. Partial molar volume of water in this solution is 15.686 x 10
-6
m
3
/mol. Determine
the partial molar volume of methanol in the solution.
07
(b) Derive phase rule for reacting system.
07
OR
2
Q.4 (a) Determine the fugacity coefficients for nitrogen and methane in a N2(1)/CH4(2) mixture
at 200 K and 30 bar, if the mixture contains 40 mol% N2.
Data given:
Experimental virial coefficient data are as follows:
B11 = -35.2 cm
3
/ mol, B22 = -105 cm
3
/ mol, B12 = -59.8 cm
3
/ mol
07
(b) List out various methods for evaluation of fugacity coefficient of pure component.
Discuss any one in detail.
07
Q.5 (a) Derive the expression relating equilibrium constant (K) with standard Gibbs energy
change (?G?) at constant temperature and pressure.
07
(b) For a system in which following reaction occurs,
4 2 2
3 CH H O CO H ? ? ?
assume there are present initially 2 mol CH4, 1 mol H2O, 1 mol CO and 4 mol H2.
Determine expressions for the mole fractions yi as a function of ?.
07
OR
Q.5 (a) Explain the method of Lagrange?s undetermined multipliers for gas phase reaction to
minimize total Gibbs free energy.
07
(b) Consider the system in which the following reaction occurs:
4 2 2
4 2 2 2
CH + H O CO +3H ....(1)
CH + 2H O CO + 4H ....(2)
?
?
If there are present initially 2 mol of CH4 and 3 mol of H2O. Determine expressions for
the yi as a functions of the ?1 and ?2.
07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020