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Math Help - Atoms to Grams

  1. #1
    Junior Member
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    Atoms to Grams

    Hi, sry again -_- but i have yet another question.. what am i doing wrong!?

    im trying to convert Atoms to Grams. EXample

    1.01023

    so im doing

    (1.01023 )(1/6.022x10^23)(196.
    96655)=3.3g (putting it to 2 sig figs.)

    same thing for 2.801022

    im doing (2.801022 )(1/6.022x10^23)(4.002602)=1.9


    ______________________________

    last but not least can you guys help me get an idea of how to do this problem i think i know how but want to verify.

    How many helium atoms are there in a helium blimp containing 535 of helium?

    so i would start off by puting 535 into grams (535000g)then divide by molar mass then multiply by avogadro = atoms (8.0*10^28)
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by Nismo View Post
    Hi, sry again -_- but i have yet another question.. what am i doing wrong!?

    im trying to convert Atoms to Grams. EXample

    1.01023

    so im doing

    (1.01023 )(1/6.022x10^23)(196.
    96655)=3.3g (putting it to 2 sig figs.)

    same thing for 2.801022

    im doing (2.801022 )(1/6.022x10^23)(4.002602)=1.9


    ______________________________

    last but not least can you guys help me get an idea of how to do this problem i think i know how but want to verify.

    How many helium atoms are there in a helium blimp containing 535 of helium?

    so i would start off by puting 535 into grams (535000g)then divide by molar mass then multiply by avogadro = atoms (8.0*10^28)
    I'd use the mole as an intermediate step, that is divide by Avogadro's constant and then by the relative atomic mass.

    \text { moles of gold} = \frac{10^{23}}{6.02 \times 10^{23}} = \frac{1}{6.02}

    m = n\,A_r = \frac{1}{6.02} \times 197 = 32.72 \text{ g }


    You appear to be an order of magnitude out by my answers, check your powers of 10?
    --------------------------

    2. Yep
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  3. #3
    Junior Member
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    1) I see what you did for the 1st problem, but i cant seem to use that method when doing

    7.41021 or 2.801022





    2) Also is the answer going to be 8 atoms or the 8.049x10^24?? (because i would have to round this to 4 sig figs since the 6.022 is 4 sig figs and since im dividing with if that makes sense?
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