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March 30, 2017

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Please help me with these two problems:
1)How many electrons would it take to equal the mass of a proton?

2)What mass of electrons would be required to just neutralize the charge of 1.0g of protons?

  • chem - ,

    Look up the mass of the proton. Look up the mass of the electron. Set up a proportion.
    Divide Mp/Me = approximately 2000 since the proton is approximately 2000 times heavier than the electron.

    The charge on the proton is about +1 and that of the electron is about -1 in arbitrary units. From the mass of the proton, calculate the number of protons in 1 gram. It will take that same number of electrons.

  • chem - ,

    Thank You. I understood the first one, but I am having trouble setting up the second one. I don't know the conversion factor.

  • chem - ,

    You have your conversion factor. The mass of the proton is xx grams, whatever you looked up. So how many protons are there in 1 gram.
    Look at it this way but we deal with B-Bs (you know, the pellet gun thing).
    1 BB weighs 0.5 grams. How many BBs are in 1 gram of BBs. Same principle.

  • chem - ,

    test

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