A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is

Options

A. `1:4`
B. `1:8`
C. `7:32`
D. `3:16`

Answer

C

Explanation

Moles of molecules of `O_(2). N_(2) = (1)/(32) : (4)/(28)`
`= (1)/(32) : (1)/(7) = (7)/(32) : 1 = 7:2`