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Water decomposes to O(2) and H(2) under ...

Water decomposes to `O_(2)` and `H_(2)` under suitable conditions as represented by the equation below :
`H_(2)Oto2H_(2)+O_(2)`
the `2500cm^(3)` is subjected to `2(1)/2` times increase in pressure (temp. remaining constant). What volume of `H_(2)` will now occupy ?

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