If this wasn't rounded to the least number of significant figures, the answer would be Bromine. The density of Bromine is 3.12 and if that answer wasn't a rounded figure, it would 3.105882353, which can be rounded to 3.12.
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If it were to be tested on water, it would sink because the density of water is about 1 gram per cm cubed, and ebony has a larger density.
2.1 grams per centimeter cubed
Density = Mass/Volume = 150/6 = 25 grams per cm3.
Density is actually weight divided by volume. 2000/4000 is 0.5 grams per centimetre cubed
It is 0.024 kilograms per cm^3 or 24 grams per cm^3.