[Organik]

I found this that made me doubt my grasp of gases (link below):

1cc (1mL, 1gram) water can be electrolysized to about 1,230cc of hydrogen and about 9,840cc Oxygen. (enough hydrogen to fill a 1-quart bottle and enough oxygen to fill 2 1/2 gallon jugs - assuming the gas is not under pressure)
The ratio of hydrogen to oxygen in water (H2O) is 2:1, but oxygen atoms have 16 times the mass of hydrogen atoms, so the ratio in volume (and mass) ends up being 1:8

Surely, if there are two moles of a gas (e.g. H₂) and one mole of another (O), then the volumes are in the same ratio regardless of the relative atomic masses.  The mass of oxygen will be eight times that of the hydrogen, but the volumes will still be in the 2H:O ratio, no?



Org.

http://www.skeptictank.net/MT/archives/2004/10/solarpowered_fi.html

[Yggdrasil]

Yes, you are correct.  Volume ratios should reflect molar ratios for gases measured at the same temperature and pressure.  This is known as Avogadro's law (http://en.wikipedia.org/wiki/Avogadro%27s_law).