The number of atoms in certain volume of hydrogen is twice the number of atoms in the same volume of helium at the same temperature and pressure'. Why?

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Solution

According to Avogadro's law, equal volumes of hydrogen and helium have the same number of molecules under similar conditions of temperature and pressure.
But since the hydrogen is diatomic(H₂) and helium is monoatomic(He.)
Therefore, the number of atoms of hydrogen is twice the number of atoms of helium at the same volume at the same temperature and pressure.

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