If you only know mass, you don't have enough information to calculate density.
You also need to know the volume of the piece that has that mass.
Once you have both of those numbers, the density is
(Mass) divided by (Volume)
of the same sample.
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You have to multiply the density by the volume to get the mass of the object.
Density = Mass/Volume so Volume = Mass/Density. Provided the object is solid.
You cannot calculate volume and density with only the mass. If the exact material forming the mass is known, then density can be looked up from a variety of sources and the volume can be calculated as mass divided by density. For example, given only the mass "10 kg" we have no way of knowing the volume or density. However, given "10 kg of gold" we can look up the density (19.3 grams per cubic centimeter) and divide 10,000 by 19.3 to get a volume of 518.13 cc.
Density = Mass/Volume so Mass = Density*Volume.
mass= density*volume