Problem
1. If the air-fuel ratio is larger than stoichiometric, is it more or less reversible?
2. What makes the fuel cell attractive from a power-generating point of view?
3. Is mass conserved in combustion? Is the number of moles constant?
4. Does all combustion take place with air?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.