Answer to Question 6

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a.    Volume of aluminium = 0.6 1.8 10-4 = 1.08 10-4 m3

Volume of magnesium = 0.4 1.8 10-4 = 0.72 10-4 m3

Mass of aluminium = 1.08 10-4 2700 = 0.29 kg

Mass of magnesium = 0.72 10-4 1700 = 0.12 kg

 

b.    Total mass = 0.414 kg

Density = 0.414 1.8 10-4 = 2300 kg m-3