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Variation of Valency

Explain why t...

Question

Explain why the number of atoms in one mole of hydrogen gas is double the number of atoms in one mole of helium gas?

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Solution

Hydrogen gas is diatomic in nature( $H_{2}$ ) while helium gas is monoatomic (He). As a result, the number of atoms in one mole of hydrogen(2 $\times$ N_A )is expected to be double when compared to the number of atoms in one mole of helium( $N_{A}$ ).

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