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A coulomb is about 6.2 x 1018 electrons, so 100 coulombs is 100 times that. Since 100 is 102, we can find the product of two numbers that have the same base (the 10) and have exponents by just adding the exponents. 6.2 x 1018 x 102 = 6.2 x 1018+2 = 6.2 x 1020 electrons

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