Question

atom in 4 gram of H2​

Answer 1

mate here is your answer...

Number of mole of H2 atoms is equal to 4/2=2moles.

number of atoms is equal to 2*6.022*10^23=12.044*10^23

hope you're happy with my answer

Answer 2

no. of moles = given mass/ molar mass

= 4/2 =2moles

1 mole has Na hydrogen molecules

so, 2 mole will have 2Na molecules

hence, 4gram dihydrogen will have

2×2Na atoms

= 4Na atoms