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?

General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter2: Atoms, Molescules, And Ions
Section: Chapter Questions
Problem 2.42QP: The mass-to-charge ratio for the positive ion F+ is 1.97 107 kg/C. Using the value of 1.602 1019 C...
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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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