Question: A 2 . 5 - g copper penny is given a charge of 2 . 0 1 0 9 C 2 . 0 1 0

A 2.5-g copper penny is given a charge of 2.0109C2.0109C.(a) How many excess electrons are on the penny? (b) By what percent do the excess electrons change the mass of the penny?

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