Hello,
I want to use gaseous ozone from a storage tank (2 L), for this I pick the gas with a small syringe (10 mL).
(in order to not change significantly the total volume)
Obviously i want to know how much ozone is in the syringe.
I have on my sensors: the pressure, the temperature, the concentration (g/Nm3 converted in g/m3) of ozone
Which equation shall i use to be accurate?
I tried C(g/m3) = m (g) /V (m3) and PV = nRT but they give incoherent results.
There is too the Van der Waals equation but i couldn't find the cohesive term (a) of ozone. I calculated the covolume (b) of ozone.
Thank you,
I'm slightly under overpressure (1.2 Bar). I use Borosilicated Glass syringe with PTFE parts. So ozone degradation is probably not important.
Ok. If you allow lets walk through this:
You can calculate the ozone mole fraction in the tank from your concentration measurement. Lets say you have the concentration X (g of ozone per cubic metre). Then you have X/M(O3) moles of ozone per cubic metre in the tank (where M(O3) is the molar mass of ozone in g). The ideal gas law lets you determine the molar density N (moles per cubic metre). The ozone mole fraction then is X/M(O3)/N. And, if there is no fractionation in the extraction, it is identical in the syringe and in the tank.
Does this answer the question, or did I misunderstand ?
I think this is a misunderstanding. You found out the ozone molar fraction, but what i'm looking for, is the mass (in g) of ozone transferred into the syringe.
But following your idea X/M gives mol/m3.
Next if we take 10 mL of the tank, (X/M)*10*10^-6 = moles in the syringe
and after n (mol) * M (g/mol)= m (g) ?
Lets denote the mole fraction of ozone as a, previously found to be a = X/M/N. With the amount of gas in the syringe ns (thats something you have to know), you calculate the ozone amount in the syringe a ns, from which you get the mass of ozone in the syringe ms as a M ns. So you can simplify ms = X ns/N.
- Badges
- Science topic
- Similar topics
- Methodology
- Sensors