Yeah, I'm not a chemical engineer..I heard that about nitromethane and oxygen off of watching NHRA drag racing.. It might be bunk.
Here is a snip from a modeler who also claims to be a combustion engineer:
Nitromethane (CH3NO2) is a colorless liquid, sweet smelling, soluable in methanol, and normally stable- but with the chemical potential to detonate. When mixed in methanol it gives the mixture the "alcohol" smell and provides some oxygen for combustion beyond the induced air.
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