A commemorative coin minted to celebrate a royal jubilee has a total mass of 16.0 g. Chemical analysis of the alloy reveals that it contains 14.0 g of pure gold, with the remainder being copper and silver to increase its wear resistance.
Using the table below, determine the purity of this gold coin in carats.
| Percentage of gold in the alloy (%) | Purity of gold in carats |
|---|---|
| 37.5 | 9 |
| 50.0 | 12 |
| 62.5 | 15 |
| 75.0 | 18 |
| 87.5 | 21 |
| 100.0 | 24 |
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Practise Edexcel GCSE Chemistry Transition metals, alloys and corrosion with exam-style questions for Foundation and Higher tier. 97 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
