In a phytoextraction trial, plants grown on soil containing copper compounds produce 8.0 tonnes of dry plant material per hectare. Burning the dry plants leaves ash equal to 12% of the dry mass. The ash contains 5.0% copper by mass. A low-grade copper ore contains 0.40% copper by mass.
What mass of this ore contains the same mass of copper as the ash from one hectare?
1.2 tonnes
12 tonnes
100 tonnes
240 tonnes
45 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.