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1 g sample of KClO(3) was heated under s...

1 g sample of `KClO_(3)` was heated under such conditions that a part of it decomposed according to the equation :
`2KClO_(3) rarr 2KCl + 3O_(2)` and the remaining underwent change according to the equation : `4KClO_(3)rarr 3KClO_(4)+KCl`
If the amount of `O_(2)` evolved was 146.8 ml at S.T.P., calculate the % by weight of `KClO_(4)` in the reside.

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