How can I find the percent compositions of N2S2?

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Answer 1 · 2014-05-28T23:45:07

To find the percent composition of N₂S₂, you divide the total mass of each atom by the molecular mass and multiply by 100 %.

% by mass = #"mass of component"/"total mass"# × 100 %

Mass of 2 N atoms = 2 N atoms × #(14.01"u")/(1"N atom")# = 28.02 u.

Mass of 2 S atoms = 2 S atoms × #(32.06"u")/(1"S atom")# = 64.12 u

Mass of 1 N₂S₂ molecule = (28.02 + 64.12) u = 92.14 u

% of N = #"mass of N"/"total mass"# × 100 % = #(28.02"u")/(92.14"u")# × 100 % =30.41 %

% of S = #"mass of S"/"total mass"# × 100 % = #(64.12"u")/(92.14"u")# × 100 % =69.59 %