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the number of atoms in a …

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the number of atoms in a certain volume of hydrogen is twice the number of atoms in the same volume of helium at the same temperature and pressure.Why?
  • 1 answers

Gaurav Seth 5 years, 3 months ago

Avogadro's Law states:

Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules.

So, according to Avogadro's law, one mole means 6.022 x 1023 particles (atoms or molecules, dependent upon the gas). 

Hydrogen gas is diatomic (H2). Helium gas is monatomic (He). Hence, hydrogen will have twice the number of atoms.

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