How many hydrogen atoms are in 4.40 mol of ammonium sulfide

The molecular formula for ammonium sulfide would be (NH4) 2S. That means in one molecule of ammonium sulfide there will be 1 N + 4 H + 2 S molecules.

Then the amount of hydrogen atoms in 4.4 moles of ammonium sulfide should be: 4.4 moles * 4/1 = 17.6 moles

If you are asked for atom count then the amount should be: 17.6 moles * 6.022x10^23 atoms/mol = 105.9872 * 10^23 = 1.06 * 10^25

The number of hydrogen atoms that are in 4.40 mol of ammonium sulfide is 2.12 x10^25 atoms

calculation

find the number of moles of Hydrogen in ammonium sulfide (NH4) 2S

that is 4.40 x number of hydrogen atoms in (NH4) 2S (4x2 = 8 atoms)

moles is therefore = 4.40 x8 = 35.2 moles

by use of Avogadro's law constant

that is 1mole = 6.02 x10^23 atoms

35.2 moles=?

by cross multiplication

{35.2 moles x 6.02 x10^23} / 1 mole = 2.12 x10^25 atoms