. A sheet of HCP Ti 2 mm thick was exposed to a chloridating gas atmosphere on one side and a de-chlorinating atmosphere on the other side at 800 oC. After having reached steady state, the Ti sheet was rapidly cooled to room temperature. The concentration of chlorine at the two phase of the sheet were determined to be 0.678 kg Cl/m3 and 0.350 Kg Cl/m3 . a. Compute the diffusion coefficient if the diffusion flux is 2.6 x 10 -7 Kg Cl/ m2 s. b. Determine the diffusion pre-exponential factor if the activation energy for the diffusion of Cl in HCP Ti is 90,450 j/mol. c. Determine the diffusion coefficient at 750 oC.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic