Combustion Reactions: ConcepTest and Example Problem

Try to answer this ConcepTest and solve the example problem before using this module. Studies show that trying to answer the questions before studying material improves learning and retention. We suggest that you write down the reasons for your answers. By the end of this module, you should be able to answer these on your own. Answers will be given at the end of this module.

Image for concepTest for Combustion Reaction Module
Example Problem 1

\[CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O\]

\[CH_4 + \frac{3}{2} O_2 \rightarrow CO + 2H_2O\]


  • Basis of 100 moles methane
  • 25% excess air
  • Complete conversion of methane
  • No partial combustion


  • Moles of air fed to reactor
  • Moles of each component in stack gas