How many hydrogen atoms are there in a 5 sample of pure hydrogen?
What is a "5 sample"?
sorry, a 5g sample.
Well, can you think of any formulae that can help you find this out? Does Avogadro's number ring a bell?
This looks like homework.
Number of atoms = Number of moles * Avogadro's Number
Use that with the molecular weight of Hydrogen for your answer.
Separate names with a comma.