A grounds maintenance contractor needs to buy enough ammonium sulfate, (NH4)2SO4\mathrm{(NH_{4})_{2}SO_{4}}(NH4)2SO4, to supply at least 24.0 kg of nitrogen. The fertiliser is supplied in 25.0 kg bags.
Use the equation:
percentage of nitrogen = (total ArA_{r}Ar of nitrogen atoms ÷\div÷ MrM_{r}Mr) × \times\,× 100
Relative atomic mass (ArA_{r}Ar): H = 1.0 N = 14.0 O = 16.0 S = 32.1
Calculate the minimum number of whole bags the contractor must buy and the total mass of nitrogen in these bags.
Show your working.
136 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.