What is the percent composition of each element found in ammonium sulfide?

The formula unit for ammonium sulfide is (NH3)2S. There are 2 nitrogen atoms, 6 hydrogen atoms, and 1 sulfur atom per formula unit. Its molar mass is 66.12g/mol.

Mass of Nitrogen = 14.007g/mol x 2 = 28.014g/mol

Percent Composition of Nitrogen = (28.014g/mol)/(66.12g/mol) x 100 = 42.37%

Mass of Hydrogen = 1.008g/mol x 6 = 6.048g/mol

Percent Composition of Hydrogen = (6.048g/mol)/(66.12g/mol) x 100 = 9.147%

Mass of Sulfur = 32.06g/mol

Percent Composition of Sulfur = (32.06g/mol)/(66.12g/mol) x 100 = 48.49%

42.37% + 9.147% + 48.49% = 100.00%