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

    Sep 23, 2013, 02:04 PM
    Differing sum of subatomic particles and mass of an atom
    Why isn't the sum of the masses of the subatomic particles of an atom equal to the mass of an atom?
    neodarwinian's Avatar
    neodarwinian Posts: 74, Reputation: 1
    Junior Member
    		  
    #2

    Sep 24, 2013, 02:25 PM
    Hydrogen is..

    1.008 grams/mole

    That is 1.008 grams is 6.022 X 10^23 atoms of hydrogen.

    So, 1 atom of hydrogen..

    1 atom H/6.022 X 10^23 atoms

    = 1.66 X 10^ -24 grams
    ===================the mass of one atom hydrogen. Check that against the one electron mass and one proton mass of hydrogen and see if there is a variance. If so, check back.
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