[21.3] Coulomb’s Law: Excess electrons are placed on a small lead sphere with mass 8.00 g

Coulomb’s Law: Excess electrons are placed on a small lead sphere with mass 8.00 g so that its net charge is -3.20×10^(-9) C.

[a] Find the number of excess electrons on the sphere.

[b] How many excess electrons are there per lead atom? The atomic number of lead is 82, and its atomic mass is 207 g/mol.
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