144. Solving a chemistry problem

6.14. The amount (V) of ethylene (273 K and 1.01 * 105 Pa) adsorbed per gram of coal at 293 K and various pressures is as follows:
P * 10–3, Pa 2.0 4.27 10.57 29.5 91.5
V * 106, m3 / g 10.4 20.8 30.5 42.4 55.2
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 2 * 104 Pa, at which gas pressure the degree of filling is 0.4.