Answer:
2 g/mol
Explanation:
The number of molecules contained in 1 mole of hydrogen gas is equal to Avogadro number:
[tex]N_A=6.022\cdot 10^{23}[/tex]
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:
[tex]m=2(1.67\cdot 10^{-27} kg)=3.34\cdot 10^{-27}kg[/tex]
Therefore, the total mass of 1 mole of hydrogen molecules is equal to the mass of 1 molecule times the number of molecules:
[tex]M=N_A m=(6.022\cdot 10^{23})(3.34\cdot 10^{-27})=0.002 kg[/tex]
Which corresponds to 2 g/mol
