How many hydrogen atoms are in 5.10 mol of ammonium sulfide?

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

Explanation:

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

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