The number of hydrogen atoms in 0.2 mol of ammonia NH3 is what

the number of hydrogen atoms in 0.2 mol of ammonia NH3 is what?

Each mole of ammonia NH3 contains 3 moles of H. So 0.2 moles of NH3 would contain 0.6 moles H. Now each mole of an element contains Avogadro' number of atoms 0.6=mol x 6.023 x 10^23 atoms/mol = 3.61 x 10^23 atoms of H