21. Based on the benzene adsorption isotherm, determine the specific surface of the adsorbent (T = 293K, S0 = 49 10-20 m2):
p/ps……………………………………… 0.06 0.10 0.15 0.20 0.25 0.30
a, mol/kg……………………………… 0.26 0.35 0.43 0.50 0.56 0.63

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