Motilal Nehru National Institute of Technology Allahabad Chemical Engineering Thermodynamics Mid-Semester Exam 2023-24 PDF

# Motilal Nehru National Institute of Technology Allahabad Mid Semester (Odd) Examination 2023-24 ## Department of Chemical Engineering **Semester:** IIIrd **Course Name:** Chemical Engineering Thermodynamics **Programme Name:** B.Tech **Course Code:** CHN-13103 **Branch:** Chemical Engineerin...

# Motilal Nehru National Institute of Technology Allahabad Mid Semester (Odd) Examination 2023-24 ## Department of Chemical Engineering **Semester:** IIIrd **Course Name:** Chemical Engineering Thermodynamics **Programme Name:** B.Tech **Course Code:** CHN-13103 **Branch:** Chemical Engineering **Duration:** 90 Minutes **Max. Marks:** 25 **Student Reg. No.:** [[ ]] **Instructions: (Related to Questions)** 1. Figures to the right indicate the full marks. 2. All questions are compulsory. Be precise in your answers. | Question | Description | Marks | CO | |---|---|---|---| | Q1 a | What are the limitations of first law of thermodynamics? Is enthalpy a true energy? Is it conserved? If not, why? | 4 | CO.1 | | Q1 b | State the difference between extensive and intensive properties. Molar enthalpy and partial molar property are intensive/extensive? | 3 | CO.1 | | Q1 c | Define Gibbs Phase Rule for reacting and non-reacting systems. What is the degree of freedom for a system containing liquid water and liquid benzene in equilibrium with their vapors? | 3 | CO.1 | | Q2 a | For a given reaction we have ∆H > 0 and AS <0. When will the reaction will be spontaneous? (a) Never (b) when T > AH/s (c) always (d) when T <AH/AS | 1 | CO.2 | | Q2 b | The statement dA≤0 means: (a) The condition for equilibrium is dA = 0. (b) Processes are not spontaneous if dA≤0 (c) dA cannot be greater than 0 (d) all of the above | 1 | CO.2 | | Q2 c | Starting from first and second law of thermodynamics, derive Maxwell equation. Clearly mention the assumptions. | 5 | CO.2 | | Q3 a | What is the definition of "partial molar property"? Try saying it in words rather than equation. | 3 | CO.3 | | Q4 b | The enthalpy of a binary liquid system of species 1 and 2 at fixed T & P is represented by the following equation: H = 400x₁ +600x2 + x₁x2(40x₁ +20x2) Where, H is in J/mol. Determine expression for H₁ and H₂ as functions of x₁, numerical values for the pure species enthalpies H₁ and H₂, numerical values for the partial enthalpies at infinite dilution H₁ and H2. | 5 | CO.3 | ## **COURSE OUTCOMES:** On successful completion of this course, the abilities of the students will be: | **CO. No.** | **COURSE OUTCOMES (COS)** | |---|---| | 1 | Ability to apply fundamental laws of thermodynamics to various processes, learning thermodynamic aspects of refrigeration and liquefaction processes | | 2 | Ability to correlate the property changes for real fluids in terms of easily measurable macroscopic properties | | 3 | Ability to apply the fundamentals of solution thermodynamics to gas-liquid mixtures and to correlate phase equilibrium of binary/multi component systems using various models | | 4 | Ability to calculate the equilibrium conversion and compositions for single and multi-reaction schemes in different types of fluid mixtures |