143. Solving a chemistry problem

6.11. The amount (V) of ethylene (273 K and 1.01 * 105 Pa) adsorbed per gram of coal at 273 K and various pressures is as follows:
P * 10–3, Pa 9.35 12.45 22.5 42.6 82.50
V * 106, m3 / g 39.5 42.8 49.9 56.5 64.5
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 5 * 10 ^ 4 Pa; determine at what gas pressure the degree of filling of the adsorbent is 0.4.