$12\mathrm{.}21$ Consider a closed vessel initially containing $1$ mol of tetrahydrofuran at $50$oC and $52$ kPa. Imagine that pure chloroform is slowly added at constant temperature and pressure until the vessel contains $1$ mol tetrahydofuran and $9$ mol chloroform. Describe the evolution of phases and phase compositions during this process. Comment on the practical feasibility of carrying out such a process. What sort of device would be required $?$ How would the total system volume change during this process $?$ At what composition would the system volume reach its maximum value?