How can I find the percent composition of (NH4)2S?

| May 27, 2018

You calculate the mass of each atom in a formula unit, divide by the formula mass, and multiply by 100 %.
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For calculation purposes, we can write the formula of (NH₄)₂S as N₂H₈S.
Mass of N = 2 atoms N × ##(14.01″u”)/(1″atom N”)## = 28.02 u
Mass of H = 8 atoms H × ##(1.008″u”)/(1″atom H”)## = 8.064 u
Mass of S = 1 atom S × ##(32.06″u”)/(1″atom S”)## = 32.06 u
Mass of (NH₄)₂S = (28.01 + 8.064 + 32.06) u = 68.144 u
% S =##(28.02″u”)/(68.144″u”)## × 100 % = 41.12 %
% H =##(8.064″u”)/(68.144″u”)## × 100 % = 11.83 %
% N =##(32.06″u”)/(68.144″u”)## × 100 % = 47.05 %

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