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Posted By: santosh kumar kanugula Member Level: Gold Posted Date: 29 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Chemical engineering CHEMICAL ENGINEERING THERMODYNAMICS-II Question paper
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Code No: RR310802 Set No. 2
III B.Tech I Semester Supplementary Examinations, February 2007
CHEMICAL ENGINEERING THERMODYNAMICS-II
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Calculate the heat required to raise the temperature of 1 mol of methane
from 2600C to 6000C in steady flow process at a pressure suciently low that
methane may be considered an ideal gas. Given the data,
A = 1.702, B = 9.081x10-3, and C = 2.164 x 10-6
(b) For steady flow in a heat exchanger at appropriate atmospheric pressure, what
is the final temperature?
i. When 10 mol of SO2 is heated from 200 to 1,1000C? A=47.381, B=66×
10-3; C=1.1×10-9.
ii. When 12 mol of propane is heated from 250 to 1, 2000C? A= - 4.798,
B=0.307, C= -0.16×10-3. [8+8]
2. Calculate the theoretical flame temperature of gas mixture consisting of 20% CO
and 80% N2 when burned with 100% excess air, both air and gas initially being at
298K. The standard heat of reaction at 298K is -293.178 J/mol. The Heat capacity
(J/mol.K) are given by Cp = a+bT +CT2. [16]
a b103 c106
CO2 26.54 42.45 -14.298
O2 25.61 13.26 -4.208
N2 27.03 5.815 -0.289
3. Derive the expressions for
^
f1and
^
f2 in a binary liquid mixture system. [16]
4. (a) Show that the partial molar mass of a species in a solution is equal to its molar
mass (molecular weight).
(b) The excess Gibbs free energy of a binary liquid mixture at T and P is given
by GE
RT = ( -2.6 x1-1.8x2)x2 x1. For the given T and P, find ln?1. and ln?2.
(c) Define acitivity and activity coecient. [4+8+4]
5. (a) Discuss the Phase behavior for Vapor / Liquid systems.
(b) Discuss about Retrograde Condensation. [10+6]
6. Calculate the fraction of liquid, liquid composition and vapor composition in a two
phase system consisting of acetone
acetonitrile - nitromethane at 800C and 110 Kpa. The overall composition of the
mixture is Z=0.45, Z=0.35 and Z=0.2. The vapor pressures of the components (1),
(2) and are 195.8 Kpa, 97.84 Kpa and 50.32 Kpa respectively. [16]
1 of 2
Code No: RR310802 Set No. 2
7. Show three types of constant pressure liquid-liquid solubility diagram with proper
labeling. What do you mean by upper and lower consolute temperature. [16]
8. Derive an equation from the fundamentals to describe the e ect of temperature on
‘K’ in terms of H0, a ß ? etc. Discuss the practical application of above
derived equation with reference to any chemical reaction. [16]
? ? ? ? ?
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