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What is no of O(2) molecules in 3.2 xx 1...

What is no of `O_(2)` molecules in `3.2 xx 10^(-15)g` sample of oxygen ? .

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Moles of `O_(2)=(3.2xx10^(-15))/(32)=10^(-16)` Molecules of `O_(2) = 10^(-16) N_(A) = 6.023 xx 10^(7)` .
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