Please solve

2. In the process of determining the diffusion coefficient of an organic liquid that has a density of 790 kg/m and a molar mass of 58 g/mol Winklemann experiment was performed (at 290 K and 99.75 kPa) using air as the flowing stream. The liquid level in the tube initially was 18 mm from the top and the level falls to 27.5 mm in 15,000 seconds. If the vapor pressure of the organic liquid is 21.95 kPa, calculate its diffusivity in air at experimental condition