[Nicolas Sanchez]

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A ‘gold medal’ used in events such as the Olympic Games is made from a silver–nickel alloy with a coating of a gold–silver alloy.
The mass of the medal is 256 g, of which 24.0g is the mass of the coating.
The density of the silver–nickel alloy is 10.0 g cm^–3 and the density of the gold–silver alloy is 16.0 gcm^–3.
What is the volume of the medal?

A. 16.0 cm^3
B. 16.9 cm^3
C. 23.2 cm^3
D. 24.7 cm^3
E. 25.6 cm^3
F. 27.1 cm^3

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Discussion

[Sonya Malan]

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Mass of silver–nickel alloy: 256g-24g = 232g

Volume of silver–nickel alloy: 232g / 10g.cm-3 = 23.2 cm3

Volume of gold–silver alloy: 24g / 16g.cm-3 = 1.5 cm3

Volume of medal: 23.2 cm3 + 1.5 cm3 = 24.7 cm3

Answer: D