4 replies to this topic

[chemproc]

How do you convert ppmv to ppmmol and vice versa. Or are they the same? If so why?

 

Thanks,

[PhilippM]

I have never actually seen those units used anywhere (and would in fact try to avoid any "parts-per" units), but if you are talking about an ideal gas: At the same temperature and pressure, every mole of every gas has exactly the same volume, so ppmv and ppmmol should be the same

[Chemitofreak]

It is quite simple. PPM or Parts Per Million is one part of a particular component in million parts of the total mixture.

 

1) ppmw = parts per million by weight = 1 milligrams per kg

 

2) ppmv = parts per million by volume = 1 milliliter per m3

 

3) ppmmoles = parts per million by moles = 1 milli-mole per kg-mole

 

you know the composition, mass of the mixture and temperature-pressure, you can inter convert  into any of the units

 

For water i.e. when density is 1000 kg/m3....1ppm = 1 mg/liter

 

For ideal gas ppmv = ppm mole as vol% = mol%

 

Revert in case of any query 

Edited by Chemitofreak, 04 June 2019 - 01:39 AM.

[oilpmp]

i use the following formula  for gases:

 

ppm w/w =(ppm v/v of component X in gas mixture Y) * (Mol. weight of component X)/ (Mol. weight of gas Y)

 

w: stands for weight ; v:stands for volume

 

For example X can be H2S compound and Y a methane gas mixture containing that H2S compound.

[nivedita12]

Please see this formula It is very good resource

 

https://neutrium.net...on-conversions/