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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. 3
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. Methane is burned with 20% excess air, both methane and air being at 298K.
The standard heat of combustion of methane at 298K is (-802.625) kJ. The heat
capacities (J/mol.K) are:Cp=a+bT+cT2.
a b 103 c 106
Cp(CH4) 14.15 75.499 -17.9915
Cp(O2) 30.255 4.207 -1.8873
Cp(N2) 27.27 4.930 3.3256
Cp(CO2) 45.369 8.688 9.6193
Cp(H2O) 28.850 12.055 1.006
Calculate the adiabatic flame temperature attained. [16]
3. (a) Define and explain partial property along with necessary equting.
(b) The partial molar volume of ethanol in a 60% ethanol-water solution is 5.5x10-6
m3. The density of the mixture is 849.4 kg/m3. Calculate the partial molar
volume of water in the mixture. [8+8]
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) Characterize ideal solutions.
(b) Two substances A and B are known to form ideal solution. An equimolar
vapor mixture of A and B initially at 100 C and 100 Kpa is isothermally
1 of 2
Code No: RR310802 Set No. 3
compressed till the mixture condenses. Determine the pressures at which
condensation begins and terminates and also the compositions of the vapor
and liquid phases. The saturation pressures of A and B at 100 C are 120 Kpa
and 150 Kpa, respectively. [6+10]
6. Determine expressions for G, H, S implied by the vander waals equations of state.
[16]
7. Discuss thoroughly equilibrium and stability. Discuss by giving suitable example.
[16]
8. Consider the reaction C4H4(g)!C4H6(g) + H2(g). the standard free energy change
is given by:
G0
T = 24,760 - 5.01T ln T + 3.09T
where G0
T is in J / mol butene and T is in K.
(a) Over what range of temperature is the reaction promising from a thermody-
namic viewpoint?
(b) For reaction of pure butene at 800 K, calculate the equilibrium conversion for
operation at 1 and 5 atm total pressure, assuming ideal gases.
(c) Repeat part (b) at 1 atm for a feed of 50 mol % butene and 50 mol % inert
gas and compare the results. [6+5+5]
? ? ? ? ?
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