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    elisabeth17's Avatar
    elisabeth17 Posts: 1, Reputation: 1
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    #1

    Mar 13, 2011, 03:57 PM
    A 3.5 g copper penny has a positive charge...
    A 3.5 g copper penny has a positive charge of 29 µC. What fraction of its electrons has it lost?
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Mar 13, 2011, 08:12 PM
    Try answering each of the following simpler questions which should lead you to the answer. If you get stuck, say where.


    How many copper atoms in 3.5 grams? (Hint: 1 mole of copper weighs 63.546 grams. That's it's atomic weight).

    How many electrons per copper atom?

    What's the charge of 1 electron?

    So how many electrons in 29 µC?

    Finally, what's the percentage of the number of electrons in 29 µC out of the total number of electrons in the penny?
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