[Spitzchan]

I'm not understanding these two questions
Calculate the number of moles of:
1) hydrogen molecules in  20g of hydrogen gas (H2)
2) hydrogen atoms in  20g of hydrogen gas (H2)

Please help me 😭🙏

[Hunter2]

1 mol hydrogen gas, it contains H2 molecules has a molar mass of about 2g/mol. Check the table of the periodic system of elements PSE.
The question ask how many mol you have if 20 g H2 is present.
And also how many mol of H atoms. One molecule contain two H atoms,

[TriVision]

A mole is a measure of amount, like a dozen meaning twelve. When they ask for the number of moles in 20g of Hydrogen gas, you are supposed to convert the 20g of hydrogen to the number of molecules present (your teacher or the problem should provide it, otherwise a simple Google search would do) then convert that number to be represented by moles (which is (6.022 x 10^23 particles). In the second part, you need to double that answer, since it's just H2.