What is the percentage by mass of nitrogen in ammonium sulfate, (NH4)2SO4\text{(NH}_4\text{)}_2\text{SO}_4(NH4)2SO4? Relative atomic masses: H=1\text{H} = 1H=1, N=14\text{N} = 14N=14, O=16\text{O} = 16O=16, S=32\text{S} = 32S=32.
10.6 %10.6\ \%10.6 %
21.2 %21.2\ \%21.2 %
28.0 %28.0\ \%28.0 %
35.0 %35.0\ \%35.0 %
39 exam-style questions on AQA GCSE Chemistry 10.4 The Haber process and the use of NPK fertilisers, covering 10.4.1a The Haber process, 10.4.1b Equilibrium and rate in the Haber process, and 10.4.2 Production and uses of NPK fertilisers. Each one has a worked solution and a mark scheme showing where the marks go.