To maintain a pressure close to 1 atm, an industrial pipeline containing ammonia gas is vented to ambient air. Venting is achieved by tapping the pipe and inserting a 3 mm diameter tube, which extends for 20 m into the atmosphere. With the entire system operating at 25 ◦C and 1 bar, the ideal gas equation of state predicts a total molar concentration of 40.9 mol m−3. Equimolar counter-diffusion can be assumed, and both the concentration of air in the pipeline and the concentration of ammonia in the atmosphere can be considered negligible. The diffusion coefficient of ammonia through air is approximately 2×10−5 m2 s−1. a) Determine the mass rate of ammonia (17 g mol−1) lost in to the atmosphere, NA, in kg/h and the mass rate of contamination of the pipe with air (29 g mol−1), NB, in the same units.