volume of 35g
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density = mass ÷ volume= 35g ÷ 25 cm3= 1.4 g/cm3 (= 1.4 gcm-3)Density = Mass/Volume = 35.0/25.0 = 1.4 g per cm3
To determine the mass of a copper object, you need to know its volume as well as the density of copper, which is 8.9 g/cm^3. The formula to calculate mass is mass = density x volume. So, if you have the volume of the copper object, you can multiply it by the density of copper to find its mass.
The density of copper is 8.94 grams per cm3. The mass will depend on the volume of the "lump" of copper.
Use your volume formula and your radius to find volume. Next use the equation d=m/v or m=dv to find your mass of copper. Use your mass, atomic weight of copper, and avagadro's number to figure out your atoms.
89.2g