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Unformatted text preview: Q 21.1 Excess electrons are placed on a small lead sphere with mass 8.00g so that its net charge is 3.20 x 109 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 Lead Ore a ) The number of excess electrons needed to produce net charge q is: b ) Use the atomic mass of lead to find the number of lead atoms in 8.00 x 103 kg of lead. From this and the total number of excess electrons, find the number of excess electrons per lead atom. The atomic mass of lead is 207 x 103 kg/mole , so the number of moles in 8.00 x 103 kg is: Avogadro’s number N A is the number of atoms in 1 mole, so the number of lead atoms is: The number of excess electrons per lead atom is: Exercise 21.24 Two charges , one of 2.50 μC and the other of 3.50 μC , are placed on the xaxis; one at the origin as shown, and the other at x = 0.600 m ....
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 Summer '09
 W.CHRISTENSEN
 Physics, Atom, Charge, Electric Fields, Mass, Electric charge, NC, excess electrons

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