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H(2)(g) and O(2) (g) combine to form H(2...

`H_(2)`(g) and `O_(2)` (g) combine to form `H_(2)O` (l) by an exothermic reaction. Then why they donot combine when kept together for any period of time?

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Because the molecules donot have enough energy to be equal to threshold energy `(E^(@))`
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