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The chemical formula of Ammonium sulfate is (NH4)2SO4. The first step to these problems is finding all the atomic weights of the elements involved (including how many atoms of each element there is) and then adding them all up to get the total molecular mass of ammonium sulfate.

Nitrogen = 14.0 × 2 = 28.0 grams

Hydrogen = 1.00 × 8 = 8.00 grams

Sulfur = 32.1 grams

Oxygen = 16.0 × 4 = 64.0 grams

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Ammonium sulfate = 132.1 grams

Then to figure out the percentage of nitrogen in the compound, take the total mass of nitrogen and divide it by the total mass.

Mass of nitrogen ÷ mass of ammonium sulfate = % nitrogen

28.0 ÷ 132.1 = .212 = 21.2% nitrogen in ammonium sulfate
(NH4)2SO4

Percentage nitrogen by mass=(Molar mass of nitrogen)/(Molar mass of ammonium sulfate)*100

In ammonium sulfate there are 2 Nitrogens, 8 Hydrogens, 4 Oxygens and 1 Sulfur, and their molar masses are 14, 1, 16 and 32 respectively. So, by dividing the molar mass of nitrogen in the compound by the total molar mass of the compound and multiplying it by one hundred we get the percentage of nitrogen.

(14*2)/(14*2+1*8+16*4+32)*100= 21.2121...

=21%

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