Question

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

• A. 1:04
• B. 1:08
• C. 7:32
• D. 3:16

Answer 1

Answer: (C)

7:32

Answer 2

By weight, the ratio of $O_2$ and $N_2$ is 1 : 4 By molecules the ratio of $\frac{1}{32} : \frac{4}{28}$ i.e. 7 : 32.