Question

how many hydrogen atoms in 5 gram H2​

Answer 1

Answer:

1.0 mole H atoms is 1.008 gram,

So 5 gram H atoms = 5 mole H

1.0 mole = 6.0* 10^23

5.0 mole H = 5*6*10^23 = 3*10^24 H atoms and that is very much

Answer 2

Answer:

If we want to make 5 molecules of water, we need 10 hydrogen atoms and 5 oxygen atoms.