You have of water. One mole of water has a mass of , and a single molecule of water contains 10 electrons. What is the total amount of charge contributed by the electrons in the water?

A hollow metal sphere of radius has a charge of distributed evenly on the entirety of the surface. Find the surface charge density.

Which of the following best represents the charge of an electron?

Imagine you have a neutral balloon. If you remove 16,000 electrons from it, what is the net charge on the balloon?

You have a neutral balloon. If you were to add 21,000 electrons to it, what would its net charge be?

= charge of one electron