27 grams.
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This is simple math. Density=Mass(grams)/Volume(milliliters) so since 3^3=27 then it works out to a simple D=54/27 aka 2. 2kg/L to be exact.
The atomic weight of copper is 63.546 grams per mole. 129 kg is equal to 129000 grams. So there are 2030.03 moles of copper. There are 6.022 x 10^23 copper atoms in a mole. So there are 12.22 x 10^26 atoms.
There are 1000 milligrams in one gram. Therefore, 27 grams is equal to 27 x 1000 = 27000 milligrams.
It is 27 grams.
Density = mas/volume = 12 g/27 cc = 0.44... recurring grams per cubic centimetre.