please answer the 2 questions please. thank you. asap

1.72 g of a powder of particle density 2500 kg/m^3 are charged into the cell of an apparatus for measurement of particle size and specific surface area by permeametry. The cylindrical cell has a diameter of 1.14 cm and the powder forms a bed of depth 1 cm. Dry air of density 1.2 kg/m^3 and viscosity 18.4 x 10^6 Pa-s flows at a rate of 36 cm^3/min through the powder (in a direction parallel to the axis of the cylindrical cell) and producing a pressure difference of 100 mm of water across the bed. Use the Carman- Kozeny equation to describe the pressure drop- flow relationship for this packed bed. Determine the surface-volume mean diameter. O 51.05 micrometer 0 26.81 micrometer O 63.16 micrometer O 82.32 micrometer Determine the specific surface of the powder sample