The density of copper is 8.94 grams per cm3.
The mass will depend on the volume of the "lump" of copper.
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To determine the mass of a copper object, you need to know its volume as well as the density of copper, which is 8.9 g/cm^3. The formula to calculate mass is mass = density x volume. So, if you have the volume of the copper object, you can multiply it by the density of copper to find its mass.
1
89.2g
density = mass ÷ volume = 890 g ÷ 100 cm³ = 8.9 g/cm³
(178)/20.5 = 8.6829 grams per cm3