Relationship between ppm and mole fraction

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SUMMARY

The discussion centers on calculating the mole fraction of O2 from a concentration of 1 ppm (parts per million) in a total pressure of 760 torr. It is established that ppm can refer to volume, mass, or molar fraction, which complicates the calculations unless the specific type is clarified. Assuming the ppm refers to molar fraction, the calculation aligns with the definition of partial pressure, allowing for a straightforward determination of the mole fraction.

PREREQUISITES
  • Understanding of partial pressure concepts
  • Knowledge of ppm (parts per million) definitions
  • Familiarity with gas laws and calculations
  • Basic skills in stoichiometry
NEXT STEPS
  • Research the differences between volume, mass, and molar fraction in ppm calculations
  • Learn about the ideal gas law and its applications
  • Study the relationship between partial pressure and mole fraction in gas mixtures
  • Explore practical examples of calculating mole fractions from ppm in various contexts
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il postino
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Homework Statement
What is the partial pressure of 1 ppm O2 knowing that the total pressure is 760 torr?
Relevant Equations
pO2 = P total . x
Hi all!

I have a question ...
I have to calculate the partial pressure of O2
Ccan I calculate the mole fraction from the data of 1 ppm of O2?
The total pressure is 760 torr
Thank you!
 
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This is poorly defined, as ppm can be by volume, by mass or by molar fraction, as long as it is not clear which version we are dealing with calculations are not obvious.

Assuming it is the molar fraction - this is a direct application of the partial pressure definition.
 
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