A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 8 by mass. Therefore, the ratio of their respective number of molecules is:

1 : 8

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1 : 1

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7 : 64

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1 :2

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Solution

The correct option is D 7 : 64
No of Molecules = $\frac{W e i g h t}{G r a m M o l e c u l a r W e i g h t} \times N_{A}$

Molecular wt of Hydrogen $N_{2}$ = 28
Molecular wt of Oxygen $O_{2}$ = 32

So Ratio of Number of molecules = $\frac{1}{32} : \frac{8}{28}$ = $7 : 64$

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