A sample of gaseous oxygen contains only...

A sample of gaseous oxygen contains only `""^(18)O` isotopes. How many neutrons are preent in 11.2 L of the gas at STP?

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No. of neutrons present in an atom of `""^(18)O` isotope =(18-8)=10
`therefore`No. of neutrons present in 11.2 L of the gas
`=(2xx10xx6.022xx10^(23)xx11.2)/(22.4)=6.022xx10^(24)`.

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