61. Solving a chemistry problem

2. During the adsorption of stearic acid from a solution in benzene on colloidal nickel, the following data were obtained:
a*105, mol/kg 2.0 3.6 4.0 4.3 4.3 4.4
С*103, mol/l 0.2 2.0 3.8 5.0 6.0 10
Calculate the Langmuir equation constants a∞ and k using the graphical method. Determine the specific active surface of the adsorbent if the area occupied by one molecule of stearic acid in a saturated adsorption layer is 25*10-20 m2.