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Question

A typical lightening bolt has about 10.0 C of charge. How many excess electrons are in a typical lightening bolt?
10.0C / (1.6 x 10^-19 C) = 6.25 x 10^19 electrons.

Is this correct?

Answer 1

Yes.

The charge on an electron is about 1.60 E-19 Coulombs.
http://www.physlink.com/Reference/PhysicalConstants.cfm

If you divide the total charge by the charge per electron, you get the number of electrons.

Number of electrons = (10.0 C) / (1.60 E-19 C / electrons)
Number of electrons = 6.25 E19 electrons.