Oxygen flows through a 10 m long pipe with a 16 cm diameter. The oxygen concentrations at both ends of said tube are 30 and 10 kg/m^3. The diffusion coefficient of oxygen in air at that temperature is 1.8x10^-5 m^2/s. How many days will it take for 100 kg to cross the high concentration end? What is the oxygen concentration 2 meters from this same end of the pipe? please need u help asap promise to upvote