How much mass would a mole of hydrogen molecules contain? Recall that hydrogen is diatomic. g/mol

2 g/mol

Explanation:

The number of molecules contained in 1 mole of hydrogen gas is equal to Avogadro number:

So, this is the number of molecules in 1 mole.

The mass of 1 molecule of hydrogen (which is a diatomic molecule) is equal approximately to the mass of two protons:

Therefore, the total mass of 1 mole of hydrogen molecules is equal to the mass of 1 molecule times the number of molecules:

Which corresponds to 2 g/mol

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