Chemical portal


Math Forum

Contact webmaster

online education
free homework help
chemistry problems
questions and answers

© 2017 WebQC.Org
All rights reserved

By using this website, you
signify your acceptance of
Terms and Conditions
and Privacy Policy.

  Sign up now to (1) ask a chemistry question, (2) share your expertise, (3) engage in conversation with other chemists.
Post new topic Reply to topic
   Chemical Community Forum Index : Chemistry forum
View previous topic :: View next topic  
Author Message

Joined: 08 Jun 2017
Posts: 1
PostPosted: Thu Jun 08, 2017 4:20 pm    Post subject: Van der Waals Questions/Need help Reply with quoteFind all posts by ricog


I am using the van der waals calculator to check my calculations but I seem to be getting very different numbers and im not sure why.

I am using this equation (P + a(n/v)^2)(v-nb) = nRT

My units are pressure in atm, volume in Liters and temp in kelvin. Im using R as atm L mol-1 k-1 . I am trying to isolate to solve for moles in a given container.

My Pressure is 3600 psi ~ 244.9655 atm
My internal volume is 41.9 L
My temperature is 294.2611111 K
The gas i am correcting for is oxygen.. My a is 1.362652 atm L^2 mol^-2 and my b is 0.03186 L/mol.

Calculating this out and solving for n i get 462.324 moles however the webqc calculator gives me 321.458....

I'm not sure if I am running into a conversion error or a simple mathematical error but if anyone could help that would be awesome!
Back to top
View user's profileSend private message
Display posts from previous:   
Post new topic Reply to topic
   Chemical Community Forum Index : Chemistry forum Page 1 of 1

Jump to:  

Page Chemical Forum from the Chemical Portal
WebQC.Org online education - help with your degree online