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23-Chem-A1 Process Balances and Chemical Thermodynamics: December 2013

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

  1. Question 1 Acetone Evaporated into Nitrogen and Compressed
  2. Question 2 Evaporator–Crystallizer Production of Potassium Sulfate
  3. Question 3 Blending Steam Streams to Make 300 °C Superheated Steam
  4. Question 4 Time to Heat a Stirred Tank and Its Contents
  5. Question 5 Excess Gibbs Energy and Vapour–Liquid Equilibrium of a Binary Mixture
  6. Question 6 Equilibrium of a Gaseous Isomerization
  7. Question 7 Enthalpy and Entropy Change of a Real Gas Across a Valve

Start with Question 1 →

National Exams — December 2013 — 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), one of Q3–Q4 (Part B) and two of Q5–Q7 (Part C); four questions of equal value constitute a complete paper. All seven are solved below for completeness. Property data needed (densities, molar masses, steam-table and thermochemical values) are stated explicitly in each Given block. Units follow the paper (mixed SI and US customary).

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