## Question 27

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Joined: Fri Sep 29, 2017 7:05 am

### Question 27

Could someone explain how you would setup number 27, " calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T = 350 K, P = 1.79 atm and V = 4.29 L: (a) irreversible expansion against a constant external pressure of 1.00atm to a final volume of 6.52 L; (b) isothermal, reversible expansion to a final volume of 6.52 L."

Diego Zavala 2I
Posts: 65
Joined: Fri Sep 29, 2017 7:07 am
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### Re: Question 27

For part a use the equation $w=-P\Delta V$ and for part b use equation w=-nRTln(V2/V1)

Humza_Khan_2J
Posts: 56
Joined: Thu Jul 13, 2017 3:00 am

### Re: Question 27

You would need to use the fact that work of expansion against opposing constant pressure is equal to -PdeltaV. This yields (-1.00 atm)(6.52-4.29 L). The second part would require the isothermal expansion equation, which is also in the book. To get n in this case for the aforementioned equation, one would need to use PV=nRT.

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