Relationship between Atomic PPM and Mole

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Homework Statement



Why does 25 atomic ppm oxygen mean 25 moles of oxygen in 1e6 mole Fe?

Homework Equations



# = mol*Avo

The Attempt at a Solution



I understand the ppm (parts per million) part. Hence why 25 ppm means 25:1e6. What I do not understand is how they go from atomic to moles....

The only way I can explain it is:

# = mol*Avo ---> Since Avogadro's number is a constant, the difference between # (atomic) and mol (moles) is just a given ratio (a number), thus you can use either... But then where is the conversion?...
 

Answers and Replies

  • #2
Borek
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Not sure what your question is. 25 ppm means 25 atoms per 106 atoms, 25 dozens of atoms per 106 dozens of atoms, 25 thousands of atoms per 106 thousands of atoms, 25*123456789 of atoms per 106*123456789 of atoms and so son. You can plug any number, including Avogadro's constant.

After all, mole is just an overgrown dozen.
 
  • #3
DrClaude
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After all, mole is just an overgrown dozen.
:rofl:

And to think I was impressed by a baker's dozen...
 
  • #4
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Thanks Borek. So what you're saying is that as long as the ratio is held, the number can be anything (even mole)? I forgot that mole is simply a means of expressing the amount of a chemical substance... just like # of atoms. Whoops.
 
  • #5
Borek
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Thanks Borek. So what you're saying is that as long as the ratio is held, the number can be anything (even mole)?

Exactly.
 

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