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Helios4242 t1_iyc4q7c wrote

Reply to comment by CMDR_kamikazze in People who are promoting hydrogen as a green fuel always forget what water vapor is one of the most powerful greenhouse gases. by CMDR_kamikazze

Great now tell me how many moles H2O produced in a combustion reaction from jet fuel providing an equal amount of energy :)

Providing one and not the other is deceptive even if accurate.

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CMDR_kamikazze OP t1_iyc5fwc wrote

BTW while with jet fuel it's about twice as much water produced, how about common car fuels, like gasoline and diesel (OMG I hate diesel, ban this thing for good already), could you calculate it? I'm not very good with hydrocarbons.

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Helios4242 t1_iyc6vdb wrote

for simplicity, I'm assuming octane (C8H18). Energy density is 46MJ/kg, so we need 2.6 kg to match the energy in 1kg H2. MW of 114 means we are using 22.8 moles, producing 9 moles of H2O per mole octane. That's 206 moles, sopretry similar. Diesel isn't gonna be much different.

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