How many electrons are equal to one coulomb?

One coulomb is defined as the amount of electric charge that is transported by a constant current of one ampere in one second. The relationship between charge and the number of electrons is based on the elementary charge, which is approximately (1.602 \times 10^{-19}) coulombs per electron.

To find out how many electrons make up one coulomb, you can divide 1 coulomb by the charge of a single electron:

[

\text{Number of electrons} = \frac{1 \text{ coulomb}}{1.602 \times 10^{-19} \text{ coulombs/electron}} \approx 6.24 \times 10^{18} \text{ electrons}

]

This calculation shows that one coulomb is approximately equal to 6.24 billion billion electrons, or roughly 6.24 x (10^{18}) electrons. Thus, the answer choice that is aligned with this understanding is the one that represents 6.28 billion billion, as it is a close estimation of the actual number, given rounding differences.

This illustrates the immense scale of the charge carried by electrons and why it is commonly represented in such large terms when discussing coulombs.