20. Based on the benzene adsorption isotherm, determine the specific surface of the adsorbent (T = 293K, S0 = 49 10-20 m2):
p/ps……………………………………… 0.08 0.16 0.25 0.35 0.45 0.52
a, mol/kg……………………………… 0.46 0.61 0.76 0.89 1.09 1.26

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