Question

Four 1L flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same temp and pressure.The ratio of total no. of atoms of these gases present in the different flasks would be:

• A. $2:1:2:3$
• B. $1:2:3:2$
• C. $4:1:2:1$
• D. None of these

Answer 1

Answer: (A)

$2:1:2:3$

According to the ideal gas equation, $PV=nRT$
The volume of four flasks is constant. It is equal to 1 L.
The pressure and temperature are also constant.
Hence, the number of moles are also constant.
Hence, the molar ratio of hydrogen,helium,oxygen and ozone is $1:1:1:1$ respectively
Hence, the ratio of the number of atoms of hydrogen,helium,oxygen and ozone is $2:1:2:3$ respectively.