Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

2

Question About Kinetics Of Batch Reactor


2 replies to this topic
Share this topic:
| More

#1 pedroarak

pedroarak

    Brand New Member

  • Members
  • 2 posts

Posted 24 June 2022 - 11:05 PM

Hi! I understand a lot of people come here to post their homework, just so someone else can solve it. I only have one doubt: i was trying to solve this problem, i can give it a rough translation:

 

Find the equation of first order for A on the gas fase, A → 1,6R, if the reaction volume, starting from pure A, is increased by 50% in 4 minutes. The total internal pressure is constant (1.2 atm) and the temperature is 25°C

 

The thing is that it's apparently supposed to be 0.447Ca, but i get 0.55Ca

Could someone possibily help to confirm if i'm wrong? I just started using moles, and then found the fractional conversion (5/6) from knowing that an increase of volume by 50% is the same thing as an increase in the total number of moles by 50%. Using the ideal gas law, we get that the total molar concentration is constant, and the concentration of A is the molar fraction of A times the total concentration. Then using that the change in concentration with time equals the reaction rate, i just integrate from the fractional conversion being 0 to 5/6 (but i changed the integration limits to make it easier to solve). What i don't understand is why using the equation that the change of moles of A in time equals the reaction rate times the volume yields a different result, like a friend of mine did, and found K=0.447. I would really like to know what i'm doing wrong!

I attached the original problem in portuguese, my answer (K=0.55) and my friend's answer (K=0.447)

I apologize if my question is not appropriate for the forum. Thanks!

 

 

Attached Files



#2 breizh

breizh

    Gold Member

  • Admin
  • 5,643 posts

Posted 25 June 2022 - 02:42 AM   Best Answer

Hi Pedro ,

As suggested in your original document , the answer is RA =- 0.447 *CA .

Hope this is helping you

Breizh 

 



#3 pedroarak

pedroarak

    Brand New Member

  • Members
  • 2 posts

Posted 25 June 2022 - 08:14 AM

Hi Pedro ,
As suggested in your original document , the answer is RA =- 0.447 *CA .
Hope this is helping you
Breizh

Thank you so much!! Really appreciated it! I admit i was a bit hopeful i was right hahaha, but at least now i know how it's done, thanks!




Similar Topics