1. A chemical engineer asks his chemist colleague to estimate the amount of heat needed to process 40 lb _m /min benzene from 30C at 1 atm to steam at 200C and 3 atm. The chemist finds that the normal boiling point is 80.1C, the critical temperature is 562K, and the critical pressure is 48.3 atm. the C _p in the liquid and gas phases are given by the expressions ( s units are in kJ/kgC and T in C.) Also estimate the heat of vaporization by the equations of Chen and Riedel and verify with tabulated data.