anonymous
  • anonymous
Use the information for the isotopes of X to calculate the average atomic mass of X, and identify the element. Isotope Abundance Mass (amu) 6X 7.5% 6.015 7X 92.5% 7.016 I'm kinda confused :/
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Zale101
  • Zale101
\(Average ~atomic~ mass~ of~ an ~element\) = \( (Abundance~percentage_1*Mass~of~Isotope~ 1)\) + \((Abundance~percentage_2*Mass~of~Isotope~ 2))\)
anonymous
  • anonymous
So would I have to calculate that like 7.5 * 6.015, and the same for the other one?
Photon336
  • Photon336
You would add the two masses together

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Zale101
  • Zale101
Correct. You'll add it with Isotope 7x to get the average atomic mass of the element
Photon336
  • Photon336
but first you need to multiply the atomic mass by the % abundance I believe
anonymous
  • anonymous
So it's 45.1125 + 648.98 ?
anonymous
  • anonymous
@Photon336 would it be 694.0925?
Photon336
  • Photon336
@Zale101 6X and 7X are just the names of the isotopes right?
Zale101
  • Zale101
I believe so.
anonymous
  • anonymous
Yeah they are...
Photon336
  • Photon336
yeah.. so convert 7.5% to decimal form which is 7.5/100 then you multiply this by 6.015 amu
Photon336
  • Photon336
remember @flatouthero its' a percentage
anonymous
  • anonymous
Oh, so it's 6.94
Zale101
  • Zale101
Correct!
Zale101
  • Zale101
:)
Zale101
  • Zale101
What element is that?
anonymous
  • anonymous
Thank you both for your help!
Photon336
  • Photon336
no problem
anonymous
  • anonymous
Lithium, btw xD

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