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Posted By: kondapalli Member Level: Gold Posted Date: 07 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Metallurgy & Material Technology THERMODYNAMICS AND KINETICS setno-4 Question paper
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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) State and explain Le-chatlier principle.
(b) Derive Kirchoff’s equation.
(c) Define and explain joule - Thomson coefficient and derive an equation for it
in terms of Vanderwalls constants [5+5+6]
3. (a) Define entropy and explain its importance.
(b) Calculate standard entropy change for the reaction at 250C.
Cr2O3 + 3C = 2Cr + 3CO
Given Data:
SO
298 = 19.4 cal/deg/mole
SO
298 = 1.36 cal/deg/mole
SO
298 = 5.68 cal/deg/mole
SO
298(Co) = 47.3 cal/deg/mole [4+12]
4. (a) What are the various factors on which the free energy of substance of a fixed
mass depends? Explain them.
(b) Derive all T ds equations from thermodynamic relations. [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) Discuss the importance of sigma function in evalution of fugacity.
(b) Explain the effect of temperature on equilibrium constant.
(c) How is equilibrium constant determined at any time? [16]
7. (a) Say true or false the following statements with suitable Explanation. Activity
of component can never be greater then unity in a system under equilibrium.
(b) State and explain Troutons rule. [16]
8. (a) explain the standard free energy change for any reaction. [6]
(b) Determine the equilibrium constant at 250c for the reaction
CH4(g) + H2O(l) ! CO(g) + 3H2(g)
Data: [10]
COMPONENT 0G at 250c
CO(g) -137.8 KJ/mole
CH4 (g) -50.09 KJ/mole
H2O (1) -238.0 KJ/mole
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