Two large tanks containing oxygen and nitrogen at 1 bar and 25°C are connected by a pipe of 0.05 m ID and 1.2 m long. The partial pressure of oxygen at one end of the tube is 0.2 bar and it is 0.1 bar at the other end. Determine the diffusion rate of O₂ through the tube assuming equimolal counter diffusion. 0.05 MID and D = 0.18 × 10^–4 m²/s.