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O(2) is evolved by heating KClO(3) using...

`O_(2)` is evolved by heating `KClO_(3)` using `MnO_(2)` as a catalyst
`2KClO_(3) overset(MnO_(2))to 2KCl+3O_(2)`
Calculate the mass of `KClO_(3)` required to produce 6.72 litre of `O_(2)` at S.T.P. [atomic masses of K = 39, Cl = 35.5, O = 16).

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22.5 g
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