A sphere is charged with electrons to

-1 * 10-5 C.

How many electrons make up this charge?

The elemental charge is 1.6 * 10-19 C.

(1*10^-5) / (1.6*10^-19) = 6.25*10^13 electrons (ans)

Notice that the charge of a sphere is very larger than charge of electron obviously, so each electron on the sphere is made of 1.6*10^-19 charge, so you found how many of these charges are required for you to make a charge of 1*10^-5

for Example: your electron has charge 2 on it

and the sphere has charge 200 on it, then the number of electrons that make up that charge will be

200/2 = 100 electrons.