HVAC · Practice-Exam-2 · Problem 66PDFSolution in PDF ↓
HVAC · Practice-Exam-2 · Problem 66
Problem & Solution
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Topic: Practice Exam #2 — Decane, which has a molecular formula of C10H22, undergoes complete stoichiometric combustion in air.
Method: What is the mass fraction of carbon dioxide in the product gas?
Formula reference: formula of C10H22, undergoes complete stoichiometric combustion in air.
Result: And then lastly for N2, 58.435 times two times 14 for one nitrogen.
Reference: look up the stoichiometric balanced reaction for decane in a table
✅ Answer: B
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Student questions asked in live office hours about this problem
OH 124 · July 6, 2026
Q: How likely are combustion and stoichiometry problems on the HVAC PE exam, and should they be skipped?
A: Dan described combustion as lower probability than it used to be, but not zero. He would not spend many hours on it, but recommended at least enough exposure to work a few representative problems because one combustion question is still plausible.