144. Solving a chemistry problem

6.13. The amount of (V) argon (273 K and 1.01 * 105 Pa) adsorbed on 1 g of coal at 194.5 K and various pressures is as follows:
P * 10–3, Pa 3.22 7.25 13.15 17.25 39.5
V * 106, m3 / g 5.09 10.02 15.56 18.81 29.14
Build the adsorption isotherm V = f (P) and p / V = f (P); describe the adsorption isotherm using the Langmuir equation, determine the adsorption value (m3 / g) at maximum adsorbent filling; determine the degree of filling of the adsorbent at a pressure of 3 * 104 Pa; at what gas pressure the degree of filling is 0.4.