The mass of a mole of hydrogen atoms is

•  The mass of a mole of hydrogen atoms is 6.02 $\times$10²³ g.

 We know that the mass of a mole of a substance is equal to the product of the molecular mass of the substance and the Avogadro number.

Now, for a hydrogen atom, the molecular mass is precisely 1.008g. Thus the mass of a mole of a hydrogen atom is 1.008$\times$6.02 $\times$10²³ g, which is approximately 6.02 $\times$10²³ g.