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Section B (Paragraph)

Answer questions up to 30 marks.
Each question carries 5 marks.

Write notes on critical phenomena.

Calculate T,, P, and V, for a gas whose a = 6.49 atm L? mol and } = 0.0562L molt.

Define enthalpy of formation. Calculate the enthalpy of formation of N,05 from following data.
2NO, + O,, > 2NO,, AH® = — 114.0 KJ, 4NO,, + O,, > 2N,0,, AH = — 102.6 KJ, No, + O,,
— 2NO, AH® = + 180.4 KJ.
Derive the relation between Cp and Cv.
State Nernst heat theorem. How is third law of thermodynamics used to find out absolute
entropies ?
Derive the relation AG? = — RTInKp.
Give group multiplication table of symmetry operations of H,O molecule.

(Ceiling of marks : 30)

Section C (Essay)

Answer any one questions.
Each question carries 10 marks.

(a) Calculate enthalpy of combustion of H,S from following data “3, വൂ, = — 20.1 KJ mol"!
“ഭം, g) = — 296.9 KJ mol! and ‏مہم :۸7ھ“‎ 7) = - 285.84 नाण 1.

(b) Calculate the entropy change in evaporation of 1 mole of water at 100°C. Heat of vapourisation
of water at 100°C is 2259.4 797.

(a) Whatis chemical potential ? Derive Gibbs-Duhem equation.
(b) Explain the concept of residual entropy.
(1 x 10 = 10 marks)

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