Question: how many electrons are there in the system?
Answer: Thus, in the average human body, there will be 50000 g/ 12 g = 4167 packets of 12 g of carbon each, i.e. 25002 x 10^23 atoms, or, expressed more conventionally, 2.5 x 10^27 atoms. Each of these has six electrons. I.e. the average human body contains about 1.5 x 10^28 electrons.