The metal's density is 7.9 g/mL
Density = Mass/Volume. Without information about the volume it is not ossible to answer the question.
Copper, in an unknown year.
that is supposed to be unknown until you figure it out.
An unknown man, in the prehistoric times.
Strontium and copper nitrate
Unknown, probably a silvery metal
A sample of an unknown metal has a mass of 35.4g and a volume of 3.11cm^3. The metal is Lead.