How many hydrogen atoms are in 4.40 mol of ammonium sulfide

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

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