N(2) gas is present in one litre flask ...

`N_(2)` gas is present in one litre flask at a pressure of `7.6 xx 10^(-10)` mm of Hg. The number of `N_(2)` gas molecules in the flask at 0°C are

`2.68 xx 10^(9)`

`2.68 xx 10^(10)`

`1.34 xx 10^(28)`

`2.68 xx 10^(22)`

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