It is extremely difficult to ‘‘aerate’’ stagnant water. Consider the process shown in the figure below. A sealed tank consists of still, deep liquid water with pure oxygen gas in the headspace. The...

It is extremely difficult to ‘‘aerate’’ stagnant water. Consider the process shown in the figure below. A sealed tank consists of still, deep liquid water with pure oxygen gas in the headspace. The temperature and pressure of the 100% O₂
gas are 298 K and 2.0 atm, respectively. Initially, the dissolved oxygen concentration of the water within the tank is uniform at 10.0 g/m³, the diffusion coefficient of dissolved O₂
in water is 2.1
 cm²/s at 298 K, and the Henry’s law constant for dissolved O₂
gas in liquid water is 0.800 atmm³/g mol at 298 K. How long will it take for dissolved oxygen concentration to reach 20 g/m³
at a depth of 0.3 cm from the water surface?