1. The problem statement, all variables and given/known data Calculate Work(w) when 6.5L of an ideal gas at an initial pressure of 34.3atm is expanded or compressed isothermally to a final volume of 34.3L reversibly. Answer in J 2. Relevant equations PV=nRT P1V1=P2V2 w=-nRT In(V2/V1) 3. The attempt at a solution Using w=-nRT In(V2/V1) I'm not given mols or T, I know T=constant, since it's isothermal Can I use PV=nRT and substitute (PV) in for (nRT) in the equation: w=-nRT In(V2/V1) ? If so, what should I use for values of P and V? Final/Initial/delta? Io PS: This may be in the wrong place, the boundary seems unclear in Chem/Phys or Phys/Chem studies.