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MikeCarra
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BUT, you won't find one single experiment where hydrogen and oxygen were mixed together and water was created without high energy added. NOT ONE.
The reaction of H2 + O2 --> H2O is thermodynamically "spontaneous" in that the Gibbs free energy of the reaction is something like -228kJ (if I remember correctly). But you are right, there is an Activation Energy required to kick off the reaction. (A catalyst, like Pt, can lower the activation energy by providing an alternate reaction pathway).
Now considering that here on earth a candle flame will provide sufficient activation energy to run this reaction forward. It isn't an insignificant amount of energy but it isn't that "amazing".
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