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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -CHEMISTRY
THIRD SEMESTER APRIL 2018
16UCH3MC01- THERMODYNAMICS
Date: 03-05-2018 Dept. No. Max. 100 Marks
Time: 09:00-12:00
PART A
Answer ALL questions. (10 x 2 20 marks)
1. What is thermodynamics? Give the important objective of it.
2. Define the term path functions.
3. Define the adiabatic process.
4. Give the significance of Joule-Thomson coefficient.
5. Calculate the maximum efficiency of a Carnot engine operating between 27oC and 127oC.
6. What is the need for the second law of thermodynamics?
7. State the law of mass action.
8. State Lechatlier principle.
9. What are the exceptions to third law of thermodynamics?
10. What are microstates?
PART B
Answer any EIGHT questions. x 5 40 marks)
11. Derive Van der Waal's equation of state.
12. Explain the principle of equipartition of energy.
13. Obtain a relationship between Cp and Cv.
14. Derive an expression for the work done in a reversible, isothermal process.
15. Derive the Kirchoff's equation. Give its application.
16. Explain the method for the determination of enthalpy of combustion.
17. Derive Gibbs-Helmholtz equation.
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18. The equilibrium constant Kp for the reaction N2 3H2 2NH3 is 1.64x10-4 at 400oC and 1.44 x 10-4 at 500oC. Calculate the mean heat of formation of 1 mole of ammonia from its elements in this temperature range.
19. Derive Van'tHoffsisochore.
20. Explain the Nernst heat theorem.
21. Differentiate classical thermodynamics from statistical thermodynamics.
22. A system of N particles has among others, two energy levels with g1 g2 U1 44 kJ/mol and U2 58 kJ/mol. Calculate the ratio of number of particles in the two energy states at 500 K.
PART C
Answer ANY FOUR questions. x 10 40 marks)
23. Explain the postulates of the kinetic theory of gases.
What is Joule-Thomson coefficient? Give its significance.
24 Derive an expression for work done in isothermal reversible expansion of an ideal gas.
Discuss the method of determination of calorific values of fuels using Bomb's calorimeter.
25. Derive SackurTetrode equation.
4g of ammonium nitrate were dissolved in 200g of water taken in a calorimeter (water equivalent
40g). A fall in temperature of 1.32 K was noted. Calculate the enthalpy of solution of
ammonium nitrate at this concentration.
26. Discuss the thermodynamics of Carnot cycle.
Derive Maxwell's equation. Give its applications.
27. Apply law of mass action for the formation of HI.
Explain the factors which alter the state of equilibrium for the above reaction.
28. How will you determine the absolute entropy of oxygen gas?
Derive Maxwell-Boltzmann statistics.