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Which has more atoms: one mole of `H_2` or two moles of `Na?`

By the definition, a mole of some objects contains fixed number of these objects. This number is called Avogadro number, is denoted `N_A` and is about `6*10^(23).` It is usually applied to collections of atoms or molecules, therefore mass of one mole usually isn't so great as one may suppose. Although we can speak about a mole of raindrops, or stars, or whatever.


This way one mole of hydrogen `H_2` molecules has exactly twice less molecules than two moles of sodium `Na.` But the question is about the number of atoms. Because each molecule of `H_2` contains two atoms (the index `2` means this), the quantity of atoms is the same.


The answer: one mole of `H_2` has the same number of atoms as two moles of `Na.`

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