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TANSTAAFL - There ain't no such thing as a free lunch.
Combining CO2 with Hydrogen to make methane (or any other hydrocarbon) takes energy,
CO2 is by definition zero.
H2O is by definition zero.
H2 is 286 KJ/Mol
CH4 is 891 KJ/Mol
CO2 + 2*H2O = CH4 + 2*O2 + 891 KJ/Mol (added energy)
If you started with Hydrogen, it would be 572 KJ less, but you still need to make hydrogen.
And that assumes no losses in the reactions, which is never the case.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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