Question

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1:8. The ratio of number of their molecule is

• A. 7 : 32
• B. 7 : 64
• C. 3 : 16
• D. 1 : 8

Answer 1

The correct option is B

7 : 64

Moloes of $O_2=\frac{x}{32};$ Moles of $N_2=\frac{8x}{28}$

Molecules $\alpha$ moles

$\frac{Moleculesof{O}_2}{Moleculesof{N}_2}=\frac{x}{32}\times \frac{28}{8x}=7:64$