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Q.

A given initial mass of KClO3 on 50 % decomposition produces 67.2 litre oxygen gas at 0∘C and 1 atm . The other product of decomposition is KCl. The initial mass of KClO3 (in gm) taken is :

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a

245

b

122.5

c

none of these

d

490

answer is C.

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Detailed Solution

KClO3⟶KCl+32O2

Mass decomposed=50m100 32×50m100×122.5

Moles 50m100×122.5=67.222.4

m=490 gm

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