1.

Calculate the massof oxygen obtained by complete decomposition of 10kg of pure potassium chlorate (Atomic mass K=39,O=16 and Cl=35.5).

Answer»

39.2kg
392kg
3.92kg
3kg

Solution :`2KCIO_(3)(s)rarr2KCI(s)+3O_(2)(g)`
2 mol 3 mol
`2xx122.5g 3xx32g`
=245g =96g
Mass of `O_(2)` obtained from 10kg `KCIO_(3)=(96)/(245)xx10=3.92` kg


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