In order to produce a certain semiconductor, a process called doping is performed in which phosphorus is diffused into germanium. If = 2.010 and the activation energy is 240.6 , determine the diffusivity of in at 830. The gas constant is = 8.314. (Express your answer to three significant figures.)

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.