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Posted By: sunil Member Level: Diamond Posted Date: 01 Aug 2008
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2008 Jawaharlal Nehru Technological University Metallurgy & Material Technology II B.Tech I Semester Supplimentary Examinations, February 2008 THERMODYNAMICS AND KINETICS Question paper
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Code No: R050211802 Set No. 3
II B.Tech I Semester Supplimentary Examinations, February 2008
THERMODYNAMICS AND KINETICS
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Write the statement for four laws of thermodynamics.
(b) Define and explain the standard state of a substance.
(c) Equation of state. [8+4+4]
2. (a) Show that internal energy is a function of temperature only.
(b) The internal energy of a closed system is given by U = 100 + 50T+ 0.04T2
in Joules. The heat absorbed Q = 4000 +16T in Joules. ( T is in Kelvin ). If
the system changes from 500 K to 1000 K, what did the work done.
(c) Calculate the work transfer and change in internal energy if the gas is changing
its state from 1 bar, 270 to 20 bar, 4000 C polytropically. [6+6+6]
3. (a) What is entropy and discuss how it is related to the degree of disorder?
(b) Derive the equation for the entropy change in ideal gases for the following
processes
i. Adiabatic process
ii. Isothermal process
iii. Isobaric process. [6+10]
4. (a) Prove that the change in internal energy Cv dt
(b) Derive Gibbs-Helmholtz equations. [16]
5. (a) What do you know about thermo chemical data. [8]
(b) Discuss the use of third law of thermodynamics in evolution of SO of a
reaction. [8]
6. (a) Derive the expression
G=RT ln (P2/P1) from the fundamentals
(b) Calculate G for the process: A(s) =Al(l) at 1000K.Given melting point of
Al=933K.heat a fusion at melting point: 10.9X103J/Mole Cp=32.5and 29.3
J/Mol.k for solid and liquid respectively. [16]
7. (a) Derive the classius-clapyron equation for liquid vapor equilibrium.
(b) The vapor pressure of a substance A at 34.70C is 100 mmHg and the heat of
vaporization of A is 38.6KJ/Mol.what is the vapor pressure at A at 650C?
(Data: Hvap: .6KJ/Mole R=8.3145J/Mo/K)
8. (a) Explain Zero order reaction.
(b) Explain collision theory of chemical reaction.
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