This is Mass Transfer. please answer all parts to question 5 . thank you

5. An arsenic thin film is laid down on the surface of silicon and arsenic diffuses into the silicon, forming a p-type material. The diffusion coefficient for arsenic is 51013cm2/s. The saturation solubility of arsenic in silicon is 21021 atoms /cm3. The initial concentration of arsenic is 1012 atoms/cm3. You can assume that the silicon is a semi-infinite slab: a. Find the arsenic concentration at 2m from the surface and the quantity of arsenic that has diffusec into the silicon in one hour. b. Find the location where the arsenic concentration is 21017 atoms /cm3 for a process time of thirty minutes. c. Find the total amount of arsenic per m2 after 30 minutes