A liquid phase reaction takes place in an ideal CSTR. The elementary decomposition reaction that occurs is A --> B+C, with a rate constant of k=0.5 min-1 . If the initial concentration of A is 3 mol/L, and the conversion is 75%, what is the theoretical time, in minutes, needed to process one reactor volume to the specified conversion?

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.