Calculating mass is near enough impossible: it has to be measured.
You can measure its volume and then if you know its density you can work out the mass. However, that requires you to know that the cube is solid and of uniform material. I am not aware of any non-destructive method of doing so.
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The shape of an object is not enough to calculate its density. You also need its mass and then Density = Mass/Volume.
The density of an object is its mass divided by its volume. Without the volume, you cannot calculate its density.
The dimension of the side in cm are required to calculate the volume (cm3) and density in g/cm3 or specific gravity of the substance is then used to calculate the mass. Mass = Volume x Density
-- Use the length of the cube's side to calculate its volume. -- Divide the cube's mass by its volume. The quotient is its density. The density is 6.25 g/cm3 . Now that you know the answer, you can fill in the missing steps, and learn something at the same time. Is that cool or what !
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