Explanation:
Given that,
Mass of metal cube, m = 20 g
Volume of cube, V =5 mL
We need to find the density of the cube. Mass per unit volume equals density.
So, the density of the cube is 4 g/ml.
We know that the density of Aluminium is 4 g/mL.
So, the cube is not Aluminium cube.
If you change the subscripts it would change the reactants or products and then you would be solving a different formula, you would change what the chemical is
X=107 because the sides of a hexagon must add up to 720