## Equations for 8.27

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

### Equations for 8.27

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

For part (a) it says there is an irreversible expansion against a constant external pressure. So you use w=-Pexternal$\Delta$V.

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 1 guest