Question

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

Answer 1

 Avogadro's Law states "Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules." 

A mole is 6.022 * 10^23 particles (atoms or molecules, dependent upon the gas). 

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

Answer 2

Answer:

Hydrogen gas exists as diatomic molecules, i.e. each hydrogen gas molecule (H2) has two atoms.

While helium gas exists as monoatomic particle that is its

atoms exist individually. Thus, one mole of hydrogen gas has double number of atoms as compare to one mole of helium gas.

Explanation:

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