You can't.
Density = (mass) divided by (volume).
That's three numbers.
I order to find any one of them, you have to know the other two.
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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.
Multiply them: density*volume = mass
Mass = (volume) x (density)
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.