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anonymous

  • 4 years ago

what is the mass in grams of 2.90x10^12 lead (Pb) in atoms ?

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  1. Mertsj
    • 4 years ago
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    What is the atomic weight of Pb?

  2. anonymous
    • 4 years ago
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    207.2

  3. Mertsj
    • 4 years ago
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    \[2.90\times 10^{12}atoms Pb \times\frac{1 mole Pb}{6.023\times 10^{23}atoms Pb}\times\frac{207.2 g Pb}{1 mole Pb}\]

  4. Mertsj
    • 4 years ago
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    I think that works out to 9.98 x10^-10

  5. anonymous
    • 4 years ago
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    how do you figure out the correct scientific notation ?

  6. Mertsj
    • 4 years ago
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    I just plug it into my calculator

  7. Mertsj
    • 4 years ago
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    But if you can't do that then do this:

  8. Mertsj
    • 4 years ago
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    \[\frac{2.90(207.2)}{6.023}=99.8\]

  9. Mertsj
    • 4 years ago
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    Now we must do the powers of 10

  10. Mertsj
    • 4 years ago
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    \[\frac{10^{12}}{10^{23}}=10^{-11}\]

  11. Mertsj
    • 4 years ago
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    So now we have: \[99.8\times 10^{-11}\]

  12. anonymous
    • 4 years ago
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    thank you !!

  13. Mertsj
    • 4 years ago
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    And we need to put that into scientific notation. Can you do that?

  14. anonymous
    • 4 years ago
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    yes sir/ma'am

  15. Mertsj
    • 4 years ago
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    Good for you.

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