1. The problem statement, all variables and given/known data One mole of an ideal gas does 3000 J work on its surroundings as it expands isothermally to a final pressure of 1 atm and volume 25 L. Determine a) initial volume and b) Temp of gas 2. Relevant equations 3. The attempt at a solution Well, its isothermal, so Temp is constant, so W = nRTln(vi/vf) It says it expands, so the initial volume is <25 L... that's kinda all I got right now; I'm not sure how to get the next step, since both T and vi are in the equation. It must have something to do with pressure.