Compressibility Factor (Z-Factor) Equation of State

Organized by textbook: learncheme.com/
An example problem where the pressure inside a bottle of CO2 is calculated using the compressibility factor equation of state. Made by faculty at the University of Colorado Boulder Department of Chemical and Biological Engineering. Reviewed by faculty from other academic institutions.
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[@LearnChemE]

This screencast has been reviewed by faculty from other academic institutions.

[@Alim3aal7aq]

I am thankful. This video helped me a lot. From KSA

[@barnabastoth3173]

If I could use one mega like once in my life, I would use it on this video.

[@qidranalifardin]

well explained than my lecturer, thanks!!!

[@jaredharris42]

extremely helpful. gonna ace my test today

[@2ris2]

Thank you so much! I have my final tomorrow and this definitely helped a lot! :D

[@theintern7054]

...you have a final tomorrow and now only you're learning the basics?? what a noob. mine is in two hours XD

[@delq]

@@theintern7054 huh ?, i'm watching this while writing mine

[@samuelnyong6045]

That was explained so well, thanks

[@Tauruschain]

This was so well structured and explained! My thanks 😊

[@tdoggwise]

This was a very helpful review of reading these charts. Thanks.

[@thevgancheetah]

you are the best man!! I couldn't thank you enough. you just made my life a whole lot easier!!!

[@larosetsubaki8064]

Thank you

[@jasonheard7192]

Thanks for helping me understand how to use the compressibility chart.

[@Vsillier]

Thanks a lot mate, this is brilliant.

[@aaroneicoff5526]

Can anyone point me to an easy-to-understand (or well explained) correlation for the Z-Factor that is simultaneously quite accurate?

[@M.Johani]

Thanx, you really helped me :)

[@hans3331000]

thank you !

[@haseebkhawaja1050]

really helpful for me thankssss. a. lottt

[@fandolindollfine6794]

wow 5 star, easy to follow

[@wuttiaowsakhon942]

thank you

[@ivanadiego6067]

Thanks! :)

[@yaraalfaqih9559]

hey please can you give me the link. that contains all the videos related to chapter.5 and 6 because there are many videos here 😢

[@myarchus1]

Couldn't you just read the reduced pressure from the intersection of the Tc and Vc lines? I get Pr=~0.35. When multiplied by the critical pressure (72.9 atm) I get 25.515 atm, which is pretty close to the value you calculated, and likely within the error of the plot.

[@azidshafikfadzli5855]

Hi there, how to find z when T is not given?

[@small_ed]

The compressibility chart contains information for pr, vr, and Tr. If two of the variables are known, the other can be found.

[@frankfei9130]

I find p to be 28.72, if it is rounded to 2 digits, shouldn't it be 29 ?

[@LearnChemE]

The difference is in rounding throughout the calculations versus carrying the digits throughout.

[@che6769]

i keep getting a really high number as my Vr please help me with this question,"Duduced the pressure exerted by 75kg of CO2 gas kept within a canister of capacity 2500L for a temperature of -30c Tc=304.2K, Pc=72.9atm. Mr=44gmol^-1" when i calculate Vr i keep getting a number over 5, please help :/

[@small_ed]

Check your units.

[@user-if2sy2yt2q]

🥺🥺😞ما افتهمت شي

[@oren9836]

noice

[@Dreamer3K]

why do we create reduced temp and pressure"? it has no justification. makes no sense.

[@LearnChemE]

Because the compressibility charts available are in terms of reduced temperature and pressure

[@small_ed]

Thermodynamics features several dimensionless parameters for convenience that may not make sense on the surface (for example, relative pressure and temperature also are dimensionless parameters used in problems involving entropy calculations). Reduced pressure and temperature are additionally convenient in presenting compressibility expressions derived from equations of state.

[@Dreamer3K]

@@small_ed thank you for answering. much apreciated.

[@excellentphantsi1217]

Badly explained