I assume you mean cm^3, in which case the density is 0.5g/cm^3.
% of volume = 100*(volume of substance that you are interested in)/(total volume) % of mass = 100*(mass of substance that you are interested in)/(total mass).
volume = mass / volume volume = 100 / 20 volume = 5
Since density is defined as mass divided by volume, the statement that the 100g piece of iron has twice the density as the 50g piece would only be true if they occupied the same volume. However, since iron is an element, it will not vary so widely in density in solid form. Thus, it is more than likely that they are different volumes with the same density, and only the mass of the first piece is twice the mass of the second.
You need to specify the units of mass and volume.
The percentages refer to the amount of a substance of interest that is contained in a compound or mixture of that and other substances. Percentage by mass = 100*mass of substance of interest/total mass. Percentage by volume = 100*volume of substance of interest/volume mass. And, incidentally, the word is definition, not diffinition.
no density equals mass divided by volume. if both solids have a mass of 100 grams (for example) one has a volume of 100 mL (or centimeters cubed), it's density is 1 g/mL if the other has a volume of only 50 mL it's density is 2 g/mL
density = mass divided by volume = 100/25 = 4 grammes per cubic centimetre.
Density = Mass/Volume = 100/200 = 0.5 grams per ml.
millimeter is not a measure of volume
Density = Mass/Volume = 10 g/100 mL = 0.1 grams per millilitre.
It's the mass divided by its volume. The volume of a rectangular prism is length times width times height. So it would be 100 grams divided by the volume, and that volume = (L*W*H)
mass is 1,2359 grams volume is 1.839 ml