LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – NOVEMBER 2010

CH 3504 – THERMODYNAMICS

 

 

 

Date : 08-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

Answer ALL questions.                                                                                               (10 x 2 = 20 marks)

 

1. Define Joule Thomson effect.
2. Distinguish between the heat capacities Cp and Cv.
3. Define heat of transition.
4. What is meant of enthalpy of neutralization?
5. Distinguish between spontaneous process and non spontaneous process.
6. Define efficiency.
7. What is a reversible process?
8. How are Kp and Kc related?
9. State Lechatlier-Braun principle.
10. State II law of thermodynamics.

 

PART – B

Answer any EIGHT questions.                                                                          (8 x 5 = 40 marks)

 

11. Prove that dP is an exact differential using ideal gas equation.
12. Derive the relation between the two heat capacities Cp & Cv of an ideal gas.
13. Calculate the reversible work done by 3 moles of an ideal gas during the expansion

from 1dm³  to  20 dm³  on surroundings at  310K.   Also calculate DE and DH.

14. State a) Graham’ law of diffusion. b) Dalton’s law.
15. Describe how enthalpy of neutralization of acid by a base can be determined.
16. Derive the expression for the efficiency of a Carnot cyclic heat engine working between

two different temperatures.

17. Prove that mixing up of equal volumes of two ideal gases is a spontaneous process.
18. Derive any two Maxwell equations.
19. The standard concentration equilibrium constant K_c^o for the formation of NH₃ at 673K is

0.5.  Find the value of Kp^o  if the reaction is   ½ N₂ + 3/2 H₂ ® NH₃.

20. Derive Kirchoff’s equation.
21. Derive the Van’t Hoff isotherm.
22. Explain the Nernst heat theorem.

PART – C

 

Answer ANY FOUR questions.                                                                                (4 x 10 = 40 marks)

 

23. a) Derive Vander Waal equation of gas. (6)

 

1. b) What is Joule Thompson coefficient?                         (4)

 

24. a) State and explain Hess’s law of constant heat of summation with a

suitable example.                                                                                                                  (5)

 

1. b) Explain bond energy and bond dissociation energy.                         (5)

 

25. a) Describe the thermodynamic principle of the working refrigerator. (5)

 

1. b) Derive Gibbs Helmholtz equation.                                                 (5)

 

26. a) State the Law of mass action and explain.       (5)

 

2. b) Derive an expression for K_p for PCl₅ <═>   PCl₃ + Cl₂.                                                  (5)

 

27. a) Apply Lechatlier Principle to N₂ + 3H₂ 2 NH₃.                         (5)

 

1. b) Calculate the equilibrium constant for a equilibrium reaction at 300K

whose  DG^o  value at this temperature is 29.29 kJ mol^-1.                                                (5)

 

28. a) State III law of thermodynamics and explain.             (5)

 

1.       b) How is absolute entropy of a gas determined?                                                                (5)

 

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