12.88/4.77 g per L = 2.7002 grams per litre
There is an error in the question because the density of Al is actually 2700 grams per litre.
The density of aluminum is calculated by dividing its mass by its volume. To convert the volume from liters to cubic centimeters, multiply it by 1000. Then, divide the mass by the volume to find the density. In this case, the density of the aluminum is 2.70 g/cm3.