Calculate the net charge on a substance con-
sisting of a combination of 7.2 × 1013 protons
and 4.8 × 1013 electrons.
Answer in units of C
+2.4*10^13 *(electron charge,e)
= 3.84*10^-6 C
To calculate the net charge on a substance, we need to determine the difference between the number of protons and the number of electrons. The charge of a proton is positive (+1.6 × 10^-19 C) and the charge of an electron is negative (-1.6 × 10^-19 C).
Given:
Number of protons (p) = 7.2 × 10^13
Number of electrons (e) = 4.8 × 10^13
To find the net charge, we need to subtract the number of electrons from the number of protons:
Net charge = (p - e) * charge of a single proton
Net charge = (7.2 × 10^13 - 4.8 × 10^13) * 1.6 × 10^-19 C
Simplifying the calculation:
Net charge = 2.4 × 10^13 * 1.6 × 10^-19 C
When multiplying these numbers, we add the exponents and multiply the coefficients:
Net charge = 3.84 × 10^(-6) C
Therefore, the net charge on the substance is 3.84 × 10^(-6) C.