Deadliest gas on the world?

[MyRedNeptune]

Bitte, ich totally screwed up. But how can H2 and O2 form H2O? Seems to me like an oxygen atom would get lost in the process.

That's right, if you have an equal amount of oxygen and hydrogen, then half of the oxygen will not be used and will just float around without a job. It takes two moles of hydrogen and one mole of oxygen to create water without any leftovers. ^^