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Compared with the energy it takes to separate oxygen and hydrogen from water, how much energy is released when they recombine?.

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The same amount of energy is released when they recombine.

How much energy is released when water is formed and split?

The decomposition of water:

H₂O → H₂ + O₂                                          Δ = +285.8 kJ/mol

The formation of water:

H₂ + O₂ → H₂O                                          Δ = -285.8 kJ/mol

Endothermic water decomposition requires 285.8 kJ of energy input per mole of degraded water. One mole of water is created from hydrogen and oxygen in the opposite reaction, which is exothermic and produces 285.8 kJ of energy. The energy level is the same, but the energy change sign is different.

Learn more about endothermic and exothermic reactions here:

https://brainly.com/question/10373907

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