Depends on the density of the substance.
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Yes, mass has mass. It is, therefore, matter. If mass did not have mass, then it is "something" with no mass. That would make it "non-matter" and perhaps it might be energy.
Large mass
mass fraction of Substance A = (mass of Sub. A) / (total mass)
mass of neutrons + mass of protons
Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.