GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2132102 Date: 07/06/2019Subject Name: Metallurgical Thermodynamics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) What is Thermodynamics? Give importance of it. 03
(b) Explain different kinds of systems in thermodynamics. 04
(c) What is thermodynamic equilibrium? Compare extensive and intensive properties. 07
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Q.2 (a) Explain energy is a state property. 03
(b) State & Define 1st law of Thermodynamics & its significance. 04
(c) Justify: Cp > Cv. 07
OR
(c) Compare and contrast Hess’ law and Kirchhoff’s law. 07
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Q.3 (a) What is heat capacity? And derive 1st law thermodynamics in terms of Enthalpy. 03
(b) Calculate standard enthalpy change for the given reaction at 473 K. 04
CO(g) + 1/2 O2(g) = CO2(g). Given that standard enthalpy change of formation at 298 K is -111kJ/mol for CO(g) and -394 kJ/mol for CO2(g). Molar heat capacity of Cp, is as follows. For CO(g) =30.0 + 0.0041 T J/K.mol, O2 =28.5 + 0.0042 T J/K.mol, CO2(g)= 44.2 + 0.0088 T J/K.mol.
(c) Derive combined expression of 1st and 2nd law of thermodynamics in terms of internal energy, enthalpy, Helmholtz free energy and Gibb’s free energy. 07
OR
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Q.3 (a) Iron melts at 1536 °C at 1 atmospheric pressure and its heat of fusion is 14 kJ/mol. This is reversible process at constant temperature and pressure. Calculate the change of entropy at melting point of Iron 03
(b) Calculate standard free energy change of reaction: Ni(s) + 1/2 O2(g) = NiO(s). At 600 K from following data: ?H°298 NiO(s)=-240.6 KJ/mol, S°298 Ni(s)= 29.8 J/K/mol, S°298 NiO(s) = 38.1 J/K/mol, S°298 O2(g)= 206 J/K/mol. Cp, Ni(s)=25.23 +43.7 *10-3 T - 105 T-2 J/K/mol. Cp, O2(g)= 30+4.2* 10-3 T-1.67 * 105 T-2 J/K/mol,
Cp, NiO(s) = 54 J/K/mol.
(c) Discuss important features of Ellingham diagram. 07
Q.4 (a) Give Maxwell’s relations. 03
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(b) State 0th and 2nd law of thermodynamics. 04(c) Explain Sivert’s and Raoult’s law. 07
OR
Q.4 (a) Write formula for Mol fraction and give definition of Molality, Molarity and Normality 03
(b) Explain fugacity, activity and mole fraction. 04
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(c) What is Free Energy? Explain concept of Gibb’s Free Energy. 07 Q.5 (a) Explain the function of slag or vice-versa. 03
(b) Write a short note on Clausius-Clapeyron equation. 04
(c) Derive and explain Gibb’s phase rule. 07
OR
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Q.5 (a) Explain the function of slag 03
(b) Explain basicity index with suitable example. 04
(c) State and explain fugacity and activity. 07
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