How do you calculate the mass of one mole of such hydrogen giving your answer to atoms four decimal places? (The Avogadro constant, L= #6.0225 xx 10^23 mol^-1#)?
Clearly, you would not be expected to know these masses. You would be expected to be able to do such a calculation if provided with the masses of the nucleon, and with
What is the mass of one mole of hydrogen molecules?