(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Consider a reversible isothermal expansion of two moles of CO2 from 1 L to 60 L at 298 K. Assume that CO2 obeys an equation of state P = nRT/(V − nb) − n2a/V 2 with b = .04286 L mol−1 and a = 3.658 L2 bar mol−2.

(a) Calculate W.

2. Relevant equations

P = nRT/(V − nb) − n^(2)a/V^2

3. The attempt at a solution

dW = -PextdV

W = -P[(int from V1 to V2)dV

= -P(60L-1L)

My issue here is, I dont know how to find P. The Van der Walls gas equation is posted above, my only issue is I dont know which V to use... Initial? Final? The difference of the two?

Thanks for the help!

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Thermodynamics - Work

**Physics Forums | Science Articles, Homework Help, Discussion**