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

28 g/mol

Explanation:

1 mole of a substance contains a number of molecules equal to Avogadro number:

This means that 1 mole of nitrogen contains molecules.

1 molecule of nitrogen consists of 2 atoms of nitrogen, each of them with an atomic mass of 14 atomic mass units; so, the total mass of 1 molecule of nitrogen is:

where is the mass of one proton.

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

So, 28 g/mol