# Electrolysis of water, an energy cost.

How much electrical energy via electrolysis would it take to create 1 litre of elemental hydrogen mixed with elemental oxygen, and how long would this take?
###### Who is Participating?

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Author Commented:
please state what type of anode and cathode would work best and iff poss some litrature or journals on this subject.
0
Commented:
1 litre of hydrogen at STP is 1/22.4 moles.
the heat of fusion of water is 1436 cal/mole, while the heat of fusion of H2 is 28 cal/mole and O2 is 106.3 cal/mole, the difference is 1355 cal/mole, but you probably won't recover the energy of the O2 recombining
65 cal = 269.5 joules
2/22.4 moles of electrons is 3356 coulombs or 3356 amp seconds
0

Experts Exchange Solution brought to you by