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"H2O is split into hydrogen and oxygen which react chemically to produce energy"

What? This is just bullshit x)

Firstly, you need energy to break bonds between atoms (the hydrogen and the oxygen). Them "reacting chemically" afterwards would not give you a net gain of energy, that's impossible.

And if you think it isn't, remember that if you could split water and recombine it to end up with more energy than you started off with, you do not only have a damn good car, you have endless amounts of energy. Unlimited power as Palpatine would say. A nice idea, but completely impossible.