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The volume of oxygen liberated at 26^(@)...

The volume of oxygen liberated at `26^(@)C` and 714 mm pressure due to thermal decomposition of x g of `KClO_(3)` and collected over water is 760 mL. what is the value of x? [Given that aqueous tenstion at `26^(@)C=26mm,K=39,Cl=35.5,O16]`

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