Excess electrons on a lead sphere

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Homework Statement

Excess electrons are placed on lead sphere with mass m=8.00g so that net charge becomes q=-3.20*10^-9 C.

How many excess electrons are there per lead atom?

Homework Equations

The Attempt at a Solution

Have found:

number of excess electrons= 2.00*10^10

atomic number of lead=82
atomic mass of lead= 207g/mol

 

[learningphysics]

how many lead atoms are in a lead sphere of 8.00g ?

 

[chaoseverlasting]

207g=6.623x10^23 atoms... 8g =? atoms. You have the excess electrons, and now the number of atoms of lead in an 8 g sphere...