can anybody explain how to do this please :
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The Density of Copper is 8.96g/cc.
Mass of copper = Density x volume = 8.96g/cc x 300cc = 2.688kg.
Mass of copper = Density x volume = 8.96g/cc x 300cc = 2.688kg.
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First you need the density of copper, which is 8.94 g·cm−3. So multiply 300 x 8.94 = 2682 gm.