# volume of water from a litre of hydrogen? Answered

Im no chemist but I am interested in what volume in litres of water would be produced from 1 litre of liquid hydrogen if burnt in air.

Of course it would evaperate and be disspersed but would be 8 litres?

2h2 + O2 = 2h2O I believe the chemical formular

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## Discussions

1 litre of liquid hydrogen is 67.8 grams
molar mass liquid hydrogen (H2) is 2.02g/mol
1 litre of liquid hydrogen is 33.564 mols

2H2 + O2 = 2H2O

33.564 mols of molecular hydrogen will make 33.564 mols of molecular Water...

molar mass of water is 18.01528 g/mol

33.564mol * 18.01528g/mol = 604.6713 grams

So...I was wrong in my other comment to The Skinnerz...a litre of liquid hydrogen will make ~605 mL of liquid...
Given the energy output of the combusion, it will probably be gas, which will be huge volume as steam goes.

Thanks folks This is really usefull I had antisipated the weight gain to be aproxamatly 10 times after seeing the atomic weights, but im suprised the volume of water is less than the volume of hydrogen it doesnt seem logical. This does answer my question though, I will have to reflect on the logic.

Yes, that's exactly the right logic. You have to use molar quantities (that is, counting atoms), not volumes of liquid. For gases, the ideal gas law (PV = nRT) means that volume and molar quantity are proportional at fixed temperature and pressure, but that's not true for either liquids or solids.