Calculate the net charge on a substance consisting of a combination of 7.3 * 1013 protons and 9.0*1013 electrons. The elemental charge is 1.6 * 10-19 C

Net Charge = - 2.72 x 10^-6 C

Explanation:

Net charge = (Charge on protons - Charge on electrons) x Elemental Charge

Net Charge = (7.3 - 9.0) 10^13 x 1.6 x 10^-19

Net Charge = - 2.72 x 10^-6 C (overall net charge is negative because of more number of electron than protons)