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Math Help - chemistry help - moles?

  1. #1
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    chemistry help - moles?

    1. how many atoms of hydrogen are in 5.3 x 10^4 molecules of sodium glutamate, NaC5H8NO4? (all the numbers are subscripts)

    2. a) how many formula units are in a 4.35 x 10^-2 g sample of KClO3?
    b) how many ions (chlorate and potassium) are in this sample?

    help please!
    i missed the chem lesson on moles so im trying to figure this all out
    Last edited by checkmarks; October 13th 2007 at 05:50 PM.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by checkmarks View Post
    how many atoms of hydrogen are in 5.3 x 10^4 molecules of sodium glutamate, NaC5H8NO4? (all the numbers are subscripts)

    help please!
    i missed the chem lesson on moles so im trying to figure this all out
    you mean NaC_5H_8NO_4 correct?

    Hint: there are 8 hydrogen atoms in every molecule of NaC_5H_8NO_4
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  3. #3
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    yeah, sorry, i dont know how to type subscripts :P

    would this be right?
    this is what i wrote:

    8 x 5.3 x 10^4
    = 4.24 x 10^5 hydrogen atoms

    and i have another question, i just editted it....this is what i did:
    2. a) mols = 4.35 x 10^-2 g / 122.5
    =3.6 x 10^-4 mols
    3.6 x 10^-4 mols x (6.02 x 10^23 molecules)
    = 2.14 x 10^-3

    b) chlorate ions:
    =4 x 2.14 x 10^-3
    potassium ions:
    =2.14 x 10^-3

    i really dont know if im doing this right
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