a. In the chemical process engineering, PFD and P&ID stand for __________________ b. How many major mechanisms of heat transfer in the chemical process engineering? Which one is transfer of heat due to the collision of the molecules? c. A reactor contains 800 kg ethanol and is fed with 200 kg/h ethanol and has one pipe going out at 160 kg/h. What is the mass balance for this reactor? Is the system under unsteady state/steady state?