Question

The cube has a mass of 72.9g.

Answer 1

Hello!

Answer:  the density is 2.7 g/cm^3  the substance is Aluminium.

Next time add the picture too its a lot harder without it...

Answer 2

Answer: if the cube is mass is 72.9g and the cube is 3 cm on each side then the density is 2, the density is 2.7 g/cm^3  and the substance is Aluminium.

Explanation: If the cube is 3 cm on each side, then it has a volume of 27 cm^3 (3 x 3 x 3). Density is mass divided by volume, so its density is 72.9/27 = 2.7 g/cm^3.  

As for the density, the cube is made of Aluminium - density is a very unique quantity.