To calculate the rate of diffusion of oxygen in the air, we can use Graham's law of diffusion, which states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass. However, since we are given the diffusion coefficient D of oxygen, we can directly use the Fick's first law of diffusion to find the rate of diffusion.Fick's first law of diffusion states that the rate of diffusion J is proportional to the concentration gradient dC/dx and the diffusion coefficient D :J = -D * dC/dx In this case, we are given the diffusion coefficient D of oxygen as 0.188 cm^2/s. However, we do not have the concentration gradient dC/dx of oxygen in the air. To find the rate of diffusion, we would need the concentration gradient or additional information about the oxygen concentration in the air.If you can provide the concentration gradient or more information about the oxygen concentration in the air, I can help you calculate the rate of diffusion.