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`

Text Solution

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`PV=nRT`
or `n=(PV)/(RT)`
Molecules `=(PV)/(RT)xxN`
`=(7.6xx10^(-10)xx1)/(760xx0.0821xx273)xx6.023xx10^(23)`
`=2.687xx10^(10)`

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