Determine the concentration in moles/m^3 of oxygen in air (21%) oxygen) assuming it acts s an ideal gas at 20oC. Oxygen diffuses to the inside of insects through tiny tubes called tracheae which average 2mm long and 2 x 10 ^-9 m^2 in cross-section. Calculate the average diffusion rate assuming the concentration of oxygen inside approaches 0. Calculate the average time it takes for a molecule to diffuse in. Calculate the average speed for such a molecule. Determine the root square mean speed for such a molecule?