3. Over a certain small range of pressures and temperatures, the equation of state of a certain substance is given with reasonable accuracy by the relation: PV =1- C- RT P where C is constant Derive an expression for the change of enthalpy and entropy of this substance in an isothermal process.

3. Over a certain small range of pressures and temperatures, the equation of state of a certain substance is given with reasonable accuracy by the relation: PV -1-C RT T* , where is constant Derive an expression for the change of enthalpy and entropy of this substance in an isothermal process. 6. What is the residual volume () for a gas that follows the EOS: a) Clausius EOS: , where b is constant b) Virial EOS: , where B is a function of T 3. Over a certain small range of pressures and temperatures, the equation of state of a certain substance is given with reasonable accuracy by the relation: PV -1-C RT T* , where is constant Derive an expression for the change of enthalpy and entropy of this substance in an isothermal process