A gold necklace often contains a mixture of gold and copper (copper is cheaper). You have a necklace that appears gold and weighs 6.5g. You want to determine whether it is pure gold. To make this calculation, which piece(s) of information do you need? i. Molar mass of gold ii. Volume of the necklace iii. Density of pure gold iv. Density of pure copper
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✓ Correct answer: E. ii. and iii.Answer: ii. and iii. With the necklace's volume, you can calculate its density (mass/volume). Compare this to the density of pure gold; if it is not identical, then you know the necklace is impure. (You would need the density of pure copper if you wanted to determine whether copper was the impurity, but that is not what the question asked.)
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