1. The problem statement, all variables and given/known data 10 moles of an ideal gas at 100 atm pressure are expanded isothermally against a constant pressure of 10 atm, to 10 at. calculate Q W deltaU and delta H (Take temp to be T) 2. Relevant equations PV = nRT DeltaH = Q (for constant P) DeltaU = Q-W U = H+PV W = Integral(PdV) 3. The attempt at a solution I wish i knew where to start... Isothermal means a constant pressure, in this case 10 atm. ...i just have no idea. PV = nRT V1 = .8314T V2 = 8.314T W= Integral(PdV) W = PIntegral(dv) W = P(v2-v1) W = 74.826 Got IT!