How can I find the percent composition of (NH4)2S?
You calculate the mass of each atom in a formula unit, divide by the formula mass, and multiply by 100 %.
For calculation purposes, we can write the formula of (NH₄)₂S as N₂H₈S.
Mass of N = 2 atoms N ×
Mass of H = 8 atoms H ×
Mass of S = 1 atom S ×
Mass of (NH₄)₂S = (28.01 + 8.064 + 32.06) u = 68.144 u
% S =
% H =
% N =