A restoration project uses phytoextraction to remove zinc ions from mine waste.
The table gives data for one harvest.
| Fresh mass of plants (tonnes) | Dry mass (% of fresh mass) | Ash (% of dry mass) | Zinc in ash (% by mass) | Zinc recovered from ash (%) |
|---|---|---|---|---|
| 18 | 28 | 6.5 | 7.2 | 80 |
1 tonne = 1000 kg
Calculate the mass of zinc recovered from this harvest.
Give your answer in kg.
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.