Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. Chemical Engineering — 23-Chem-A4 Chemical Reactor Engineering, December 2019. Open-book, 3 hours. Five questions; answering any four constitutes a complete paper (each worth 25 marks). All five are solved below.
Reference texts. O. Levenspiel, Chemical Reaction Engineering, 3rd ed. (Wiley, 1999); H. S. Fogler, Elements of Chemical Reaction Engineering, 5th ed. (Pearson, 2016); Perry's Chemical Engineers' Handbook, 9th ed. Gas constant $R = 0.082057\ \text{L}\,\text{atm}\,\text{mol}^{-1}\text{K}^{-1} = 8.314\ \text{J}\,\text{mol}^{-1}\text{K}^{-1}$.