If your body develops a charge of -18 (microcoulombs), how many excess electrons has it acquired?

Answer 1

One electron has a charge of 1.6E-19 coulombs
16E-19 coulombs/e x #e = 18E-6 coulombs.
Solve for #e.

Answer 2

If your body develops a charge of -10 (microcoulombs), how many excess electrons has it acquired?

Answer 3

and what is their collective mass