Question

$4$ one litre flasks are separately filled with the gases, $O_2,F_2,C{H}_4$ and $C{O}_2$ under the same condition of temperature and pressure. The ratio of number of molecules in these gases is:

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

Answer 1

The correct option is B $1:1:1:1$

According to Avogadro's law, two given samples of an ideal gas, of the same volume and at the same temperature and pressure, contain the same number of molecules.
So, all the flasks would contain same no. of molecules.
$\therefore$ Ratio of no. of molecules of $O_2,F_2,C{H}_4$ & $C{O}_2\text{is}1:1:1:1$.