Question 1 from HW

Since 1 proton has a charge of 1.6 x 10^-19, 4 C is made up of 4 divided by this number (that we usually call e).

Same logic for the electron question: -2.5 divided by e

There is another method. There are 6.25 x 10^18 protons per C of charge. So, 4 C would be 4 times 6.25 x 10^18 protons. Similarly, -2.5 C would be 2.5 times 6.25 x 10^18 electrons