Chemical Engineering Thermodynamics I — Summer 2025

Briefly explain third law of thermodynamics

Write a short on Hess’s law of constant heat summation.

Derive equation for the first law of thermodynamics for steady state flow process

Discuss Redlich – Kwong – Soave equation of state.

Discuss different statements of second law of thermodynamics.

Air has volume of 0.02271 m3/mol at 0℃ and 1 bar. The initial conditions of air are 1 bar and 25 ℃.It is compressed to 5 bar and 25 ℃ by cooling at constant pressure followed by heating at constant volume. Calculate Q, W, ΔU and ΔH. Assume that air is an ideal gas. Cv =5/2×Rand Cp = 7/2×R. Take R = 8.314 J/mol K.

Reported values for the Virial coefficients of Isopropanol vapor at 200 ℃ are B= − 388 cm3/mol C= − 26000 cm6/mol2.Calculate Vand Zat 200 ℃ and 10 bar using i) the ideal gas equation ii) Truncated form of Virial equation.

Define: (a) Closed system (b) Triple Point (c) Path function03

04 Explain in brief: Clausius inequality

07 Asteel casting of mass 10 kg at 800 ℃ is quenched in 100 kg water at 30℃ In an insulated container. The heat capacities of steel and water are 0.461 kJ/kg K and 4.23 kJ/kg Krespectively. Calculate change in entropy of steel and water.

Discuss briefly limitations of first law of thermodynamics.

Draw a neat sketch of The Principle of Absorption Refrigeration. Calculate the theoretical flame temperature for CO when burned with 100%

07 excess air when both the reactants are at 373 K. The heat capacities (J/mol K) may be assumed constants i.e. 29.23, 34.83, 33.03, 53.59 for CO, O , Nand CO222 respectively. The standard heat of combustion at 298 Kis – 283.178 kJ/mol CO.1

Explain concept of entropy in brief.

𝜕V ( ) Using Maxwell equations prove that dS = CvdT− 𝜕T PdV. T ( 𝜕V ) 𝜕P T

It is required to freeze 1 kg of water at 273 Kusing refrigeration machine which operates in the surroundings at 300 K. The latent heat of fusion of ice is 334.11 kJ/kg at 273 K. Determine i) minimum amount of work required ii) The heat given up to the surroundings.

Discuss T-Hdiagram briefly.

Mercury has a density of 13.69  103 kg/m3 in the liquid state and 14.193  103 kg/m3 in the solid state, both measured at the melting point of 234.33 Kat 1 bar. If the heat of fusion of mercury is 9.7876 kJ/kg, what is the melting point of mercury at 10 bar?

dA A For flow through nozzle prove that = (M 2-1) du u

Explain throttling process.

Write short note on multistage compression.

For an Ideal gas undergoing an adiabatic process Prove that PV𝛾 = const

Discuss Gibb’s Phase Rule.

Discuss Carnot Principle with the help of P-Vdiagram.

Discuss PVT behavior of pure fluids.