The number of moles of oxygen in $1 \ L$ of air containing $21 \%$ oxygen by volume,at standard temperature and pressure $(STP)$,is (in $mol$)
- A$0.186$
- B$0.21$
- C$2.10$
- D$0.0093$
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View SolutionWhich gas among the following contains the maximum number of molecules at $STP$? (Molar masses in $g \ mol^{-1}$: $CO_{2}=44, Ar=39.9, CH_{4}=16, O_{2}=32$)
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is $1 : 4$. The ratio of the number of their molecules is:
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