[CelticKhemist2000]

I'm having trouble understanding why there's a "1/2" next to the O₂ in the reaction equation? I thought it meant just only 1 oxygen atom changed from it's diatomic gaseous form reacted with the H? But the product still says H₂O so there's 2O to ever H? I'm just a little confused as to what "1/2" means.

[Borek]

But the product still says H₂O so there's 2O to ever H?

Huh? ₂ in H₂O doesn't refer to O, but to H.