Ammonium sulfate, (NH4)2SO4(\text{NH}_4)_2\text{SO}_4(NH4)2SO4, is a high-solubility inorganic salt widely used as an agricultural fertilizer to supply both nitrogen and sulfur to alkaline soils.
What is the percentage by mass of nitrogen in ammonium sulfate?
(Relative atomic masses, ArA_{\text{r}}Ar: H=1.0\text{H} = 1.0H=1.0, N=14.0\text{N} = 14.0N=14.0, O=16.0\text{O} = 16.0O=16.0, S=32.1\text{S} = 32.1S=32.1)
10.6%10.6\%10.6%
21.2%21.2\%21.2%
21.9%21.9\%21.9%
26.9%26.9\%26.9%
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.