I am struggling with understanding this review question, I have changed the numbers to practice the problem again later on. If I have a 2.5 gram copper penny and it has a charge of -2.0×10-9C (i) How many excess electrons are on the penny? (ii) By what percent do the excess electrons change the mass of the penny? If the penny's mass remains the same but the charge changes to 4.0×10-9C (iii) How many electrons have been removed from the penny?

I am struggling with understanding this review question, I have changed the numbers to practice the problem again later on. If I have a 2.5 gram copper penny and it has a charge of -2.0×10-9C (i) How many excess electrons are on the penny? (ii) By what percent do the excess electrons change the mass of the penny? If the penny's mass remains the same but the charge changes to 4.0×10-9C (iii) How many electrons have been removed from the penny?

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Question

I am struggling with understanding this review question, I have changed the numbers to practice the problem again later on.

If I have a 2.5 gram copper penny and it has a charge of -2.0×10^-9C

(i) How many excess electrons are on the penny?

(ii) By what percent do the excess electrons change the mass of the penny?

If the penny's mass remains the same but the charge changes to 4.0×10^-9C

(iii) How many electrons have been removed from the penny?

(iv) If only one electron is removed from the atom, what percent of the atoms are ionized by this charging process?

Any help would be greatly appreciated :)

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