A device has been designed to measure the flow rate of carbon dioxide evolved from a fermentation reactor. The reactor is sealed except for a tube that allows the generated carbon dioxide to bubble through a soap solution and into a vertical glass tube with an internal diameter of 1.2 cm. On leaving the soap solution, the gas forces thin soap films stretched across the tube to traverse the Length of the tube. Ambient temperature and pressure are 27°C and 755 mm Hg. It takes the films 7.4 s to traverse the 1.2 m between two calibration marks on the tube.

(a) Sketch the apparatus.

(b) What is the rate of generation of CO2 in mol/min?