Oxygen is present in a 1 litre flask at ...

Oxygen is present in a 1 litre flask at a pressure of `7.6 xx 10^(-10) mm` of Hg. Calculate the number of oxygen molecules in the flask at `0^@C`

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The correct Answer is:

`(2.7 XX 10^(10))`

`nN_(A) = (pV)/(RT), 2.7 xx 10^(10)` molecules

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