Recall that density is the ratio of the mass and volume of an object:
Also, the volume of a sphere is given by:
Avogadro’s number = 6.022 x 1023 entities
entities = atoms, ions, molecules, particles, formula units
Molar mass of Cu = 63.55 g/mol
The volume of a sphere is (4/3)πr3 and the density of copper is 8.96 g/cm3.
What is the radius (in cm) of a pure copper sphere that contains 1.37 1024 copper atoms?
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