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mmol/mol to ppm

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  • mmol/mol to ppm

    I have been given gas concentration values in mmol/mol and need to calculate them to ppm? Could anyone help?

    H2O 670.9 mmol/mol and CO2 of 200.5 mmol/mol.

    If you could show an example (step by step) or explain the steps that would be great!

    thank you

  • #2
    Originally posted by kesta View Post
    I have been given gas concentration values in mmol/mol and need to calculate them to ppm? Could anyone help?

    H2O 670.9 mmol/mol and CO2 of 200.5 mmol/mol.

    If you could show an example (step by step) or explain the steps that would be great!

    thank you
    Ppm is ambiguous and meaningless unless you define the basis of the ratio. Gases are usually expressed as a molar ratio; for ideal gases (or nearly ideal) by Dalton's Law of Partial Pressures, pressure and volume ratios are the same as molar ratios. Solids are usually mass/mass; sometimes gases are expressed that way. Liquids may be volume/volume, mass/mass, mass/volume.

    For your gases, express as micromoles per mole (µmol/mol) and its ppm. 670.9 mmol/mol = 670 900 µmol/mol

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