In Tikrit city, environmental engineers are monitoring the diffusion of CO2 in the air as part of a pollution control study. The air-carbon dioxide mixture is at 295 K and 202.6 kPa, and the concentration of CO2 at two planes, 3 mm apart, is 25 vol.% at the first plane and 15 vol.% at the second plane. The diffusivity of CO2 in air under these conditions is 8.2 × 106 m²/s. The study aims to calculate the rate of CO2 transfer across these two planes in two different scenarios: 1. What is the main engineering issue being addressed in this scenario? 2. Calculate the concentration of CO2 at the two planes in mol/m³ and determine the rate of transfer of CO2 using the diffusivity of CO2 in air. 3. With an engineering solution approach to solve the issue, calculate the rate of transfer of CO2 across the two planes assuming two scenarios: equimolecular counter diffusion and diffusion through a stagnant air layer. 4. Determine if there is a significant difference between the results of equimolecular counter diffusion and stagnant air diffusion, and explain the implications for environmental engineering in Tikrit city. 5. Rate your ability to solve the problem (Up to 4.0).