Quote:
Originally Posted by Michaelangelica
Does it take a lot of energy to extract hydrogen from water?
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To calculate the energy needed to separate hydrogen and oxygen from water by electrolysis you can use
Faraday's Laws of Electrolysis.
- where Q is the charge in Coulombs
is the number of electrons- and F is Faraday’s constant = 96,500 C/mol
One gram of hydrogen is approximately one mole.
Converting to energy requires:
I didn’t calculate the voltage but got it
here
Or
0.033 kilowatt hours to produce one gram of hydrogen.
It is, however, very rare to use hydrogen from water like this. The vast majority of hydrogen is produced from hydrocarbons such as natural gas.
-modest
