Equations for 8.27

Moderators: Chem_Mod, Chem_Admin

Kyle_Diep_4E
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

Equations for 8.27

Postby Kyle_Diep_4E » Sat Jan 23, 2016 8:40 pm

For this problem, it breaks up the two processes into irreversible and isothermic reactions. Which formulas am I supposed to use for each of them?

Jacob Afable 3J
Posts: 41
Joined: Fri Sep 25, 2015 3:00 am

Re: Equations for 8.27

Postby Jacob Afable 3J » Sat Jan 23, 2016 9:10 pm

For part (a) it says there is an irreversible expansion against a constant external pressure. So you use w=-PexternalV.

For part (b) it talks about an isothermal, reversible expansion.

You would use the work equation w=-nRTln(vf/vi). But in order to find how many moles there are, you would use the ideal Gas law PV=nRT and solve for n. Then from there you just plug and chug.

Hope this helps!


Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests