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23-Chem-A1 Process Balances and Chemical Thermodynamics: May 2015

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Cooling a Hot Flue Gas by Spraying Liquid Water
  2. Question 2 Adiabatic-Corrected Flash of an Ethanol–Water Mixture
  3. Question 3 Two-Stage Water Recovery with Interstage Compression
  4. Question 4 Ethylbenzene Reactor with a Di-Ethylbenzene Side Reaction
  5. Question 5 Activity Coefficients and Excess Gibbs Energy of Acetone–Chloroform
  6. Question 6 Deriving Activity Coefficients from a $G^E$ Correlation
  7. Question 7 Reaction Equilibrium of ZnO(s) + CO(g) ⇌ Zn(g) + CO₂(g)

Start with Question 1 →

National Exams — May 2015 — 04-Chem-A1 Process Balances and Chemical Thermodynamics. Three-hour, open-book exam; any non-communicating calculator permitted. Format: seven questions in three parts — answer one of Q1–Q2 (Part A, 15 marks), one of Q3–Q4 (Part B, 25 marks) and two of Q5–Q7 (Part C, 30 marks each); four questions totalling 100 marks constitute a complete paper. All seven are solved below for completeness. Property data (Cp coefficients, steam-table and thermochemical values) are stated explicitly in each Given block.

Reference texts: Felder, Rousseau & Bullard, Elementary Principles of Chemical Processes (4th ed., Wiley) — material & energy balances, humidity, phase equilibria and reactive systems; Smith, Van Ness, Abbott & Swihart, Introduction to Chemical Engineering Thermodynamics (8th ed., McGraw-Hill) — excess Gibbs energy, VLE, activity-coefficient models and reaction equilibrium; supporting data from the NIST/ASME steam tables, Perry's Chemical Engineers' Handbook (9th ed.) and the NIST Chemistry WebBook.