Question

Tomorrow is my paper plzz fast ​

Answer 1

H2 is gas and molecule of hydrogen

made of two atom of hydrogen.

1 mole of hydrogen gas having molecular weight 2

now 2H

it is 2 atom of hydrogen

it is two mole of hydrogen atom having molecular weight 1

Answer 2

H2 is the diatomic molecule of hydrogen.

2H is 2 atoms of hydrogen that are not bonded to each other. If the 2H has a + or a - behind it, it is 2 hydrogen cations or 2 hydride anions, resp.