×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

%Mole vs %Volume
2

%Mole vs %Volume

%Mole vs %Volume

(OP)
Just to be sure...
When I see some natural gas mixtures mostly its broken down into volume percent but every once in a while i see mole percent. Its my understanding that these values (%mole and %volume) are the same. Am I correct?

RE: %Mole vs %Volume

Yes, assuming you are not near the mixture critical point.

RE: %Mole vs %Volume

for a gas mixture, they can only report mole percent since the GC measures the molecules, not the volume.

You can download US standards for natural Gas compostional analysis from the gpagolbal.org website.

RE: %Mole vs %Volume

Because your assumption here is Ideal gas conditions. PV=nRT so your V% should go along with the n% as long as your not close to the critical point or phase changes as previously point out.

So as a rule you can't apply this on liquid chromatograph readings. Adding Compressibility factors can help you get closer to those vol% to mol% conversions.

Awesome reference paper Ione; I will forward this to all everyone here.

S Mehta

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources