Multiple choice

Four one–litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be:

  1. 1:1:1:1

  2. 1:2:2:3

  3. 2:1:2:3

  4. 3:2:2:1
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C Correct answer
Explanation

At STP, 1 liter of any gas contains the same number of molecules (Avogadro's Law). The number of atoms is: H2 (2), He (1), O2 (2), O3 (3). The ratio is 2:1:2:3.

AI explanation

According to Avogadro's law, equal volumes of all ideal gases at the same temperature and pressure contain an equal number of molecules. Since each flask has a volume of one liter under identical conditions, they all contain the same number of molecules. Therefore, the ratio of total atoms depends solely on the atomicity of the gases, which is 2 for hydrogen, 1 for helium, 2 for oxygen, and 3 for ozone. The ratio of the total number of atoms of hydrogen, helium, oxygen and ozone is 2:1:2:3.

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