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qid 11449 · engineering

Question: The air used for the combustion of a hydrocarbon was suppliedat 25°C and 100kPawith a relative humidity of 48%. Determine (a) the carbon / hydrogen ratio of the fuel on amass basis and (b) the percent theoretical air employed in thecombustion process, if an analysis of the products of combustionyields the following volumetric composition on a drybasis: CO_2 - - 13.0%; O_2 - - 3.1%; CO - - 0.3%.N_2 - - 83.6%

  1. Carbon / Hydrogen ratio: 7.67, Theoretical air percentage: 125.3%
  2. Carbon / Hydrogen ratio: 5.67, Theoretical air percentage: 120.3%
  3. Carbon / Hydrogen ratio: 6.67, Theoretical air percentage: 110.3%
  4. Carbon / Hydrogen ratio: 6.17, Theoretical air percentage: 100.3%
  5. Carbon / Hydrogen ratio: 6.67, Theoretical air percentage: 115.3%
  6. Carbon / Hydrogen ratio: 7.67, Theoretical air percentage: 90.3%
  7. Carbon / Hydrogen ratio: 7.17, Theoretical air percentage: 110.3%
  8. Carbon / Hydrogen ratio: 5.67, Theoretical air percentage: 105.3%
  9. Carbon / Hydrogen ratio: 8.67, Theoretical air percentage: 95.3%
  10. Carbon / Hydrogen ratio: 4.67, Theoretical air percentage: 130.3%

Our answer: E. Carbon / Hydrogen ratio: 6.67, Theoretical air percentage: 115.3% Source quote machine-checked (exact quote)

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How it was answered

Multi-step solver (maze), replayed by code

card: maze · card sha256 4ff1aefba9ffb86a…

Current source

msubbu.in, "Orsat Analysis of Flue Gas" - Solved Problems in Process Calculations

https://msubbu.in/sp/pc/OrsatExcessAir.htm

“Theoretical air demand = air needed for complete conversion of carbon to carbon dioxide and hydrogen to water vapor”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T01:43:48.249Z

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Earlier version (superseded)

No public source has been found for this card yet (3 places checked internally).

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