Ammonium sulfate is a widely used agricultural fertilizer with the chemical formula (NH4)2SO4(\text{NH}_4)_2\text{SO}_4(NH4)2SO4.
Calculate the percentage by mass of nitrogen in ammonium sulfate. Give your answer to 3 significant figures. (relative atomic masses: 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)
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.