What is the value of one coulomb in terms of electrons?

The value of one coulomb can be understood through the fundamental relationship between charge and the electron's charge. An electron has a charge of approximately -1.6 x 10^-19 coulombs. To determine how many electrons constitute one coulomb, we can divide one coulomb by the charge of a single electron:

1 coulomb / (1.6 x 10^-19 coulombs/electron) equals approximately 6.25 x 10^18 electrons.

This calculation indicates that one coulomb is equivalent to about 6.25 x 10^18 electrons. Rounding this value appropriately gives approximately 6.28 x 10^18 electrons, which aligns with the correct choice. This precise relationship is important for understanding fundamental electric charge and is routinely utilized in calculations involving electric current and charge in various applications.