Step-by-step explanation:
It is known that density is equal to mass of a substance divided by its volume.
Mathematically, Density =

It is given that mass of aluminium block is 8.51 kg and volume is 3.15 L. Therefore, calculate the density of given block as follows.
Density =

=
= 2.701 kg/L
Thus, we can conclude that density of given aluminium block is 2.701 kg/L.