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What is the ratio of number of molecules...

What is the ratio of number of molecules, if the mass ratio of `N_(2) and O_(2)` is `4:1`? 

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Ratio of molecules of `N_(2) and O_(2) =`
Ratio of number moles of `N_(2) and O_(2)=`
`(4)/(28):(1)/(32)=(1)/(7):(1)/(32)=32:7`
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