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23-Chem-B10 Life Cycle Assessment (LCA): Undated paper

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

  1. Question 1 LCA Perspectives, Boundaries, Risk Components, and Refrigerant Families
  2. Question 2 Tier 1 Economic and Environmental Performance Evaluation – TDI Production Routes
  3. Question 3 Estimation of Contaminant Effects – Golf-Course Pond 2,4-D Spill
  4. Question 4 Streamlined LCA Comparison – Gasoline vs. Electric Vehicle
  5. Question 5 Sustainable Engineering Practice

Start with Question 1 →

National Exam 16-Chem-B10, Life Cycle Assessment (LCA) — undated sitting. 3 hours, Closed-Book Exam (approved calculator and one double-sided aid sheet permitted). Question 1 is mandatory (25 marks); any three (3) of the remaining four (Questions 2–5) constitute a complete paper, and only the first four questions as they appear in the answer book are marked. All five questions are solved below for completeness.

Table 1 (Question 2) repeats the same Price and Market values across unrelated compounds, so this solution computes the Economic Index from the Stoichiometric-factor and Cost columns only, and flags every place a value had to be assumed.

Reference texts: Baumann & Tillman, The Hitch Hiker's Guide to LCA; Graedel & Allenby, Industrial Ecology and Sustainable Engineering; Schwarzenbach, Gschwend & Imboden, Environmental Organic Chemistry, 3rd ed.; Mackay, Multimedia Environmental Models: The Fugacity Approach, 2nd ed.; American Conference of Governmental Industrial Hygienists (ACGIH), TLVs and BEIs; Peters & Timmerhaus, Plant Design and Economics for Chemical Engineers; Davis & Cornwell, Introduction to Environmental Engineering.