You may have noticed that water sometimes drips from the exhaust of a car as it is running. Is this evidence that there is at least a small amount of water originally present in the gasoline?
not sure if there is one.
The Attempt at a Solution
I'm not sure of the exact chemistry behind this, but I think just because there's water as a product doesn't mean there was water as a reactant — it could well have just been created out of hydrogens from some molecule and oxygens from other molecules. However, this is pretty vague, and I'd like some help coming up with a more chemistry—appropriate answer.