charge on 1/2kg of electrons..?
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The mass of an electron is 9.11×10−31 kg, so you need 1.10*10^30 electrons to get a mass of 1 kg. Their total charge will be 1.10*10^30 times that of a single electron (−1.61×10−19 Coulomb), which is -1.77*10^11 Coulomb.
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answer .-1.77*10^11c
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