Question

Four one litre flasks are separately filled with gases $O_2,F_2,C{H}_4$ and $C{O}_2$ under same conditions.

The ratio of the number of molecules in these gases are:

• A. $2:2:4:3$
• B. $1:1:1:1$
• C. $1:2:3:4$
• D. $2:2:3:4$

Answer 1

Answer: (B)

$1:1:1:1$

Avogadro's law: It states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.

$n_1:n_2:n_3:n_4=\frac{PV}{RT}:\frac{PV}{RT}:\frac{PV}{RT}:\frac{PV}{RT}=1:1:1:1$

So, the ratio of no. of molecules $=1:1:1:1$

The correct option is $B.$