According to the nitrogen adsorption isotherm, determine the specific surface of the adsorbent (T = 77K, S0 = 16.2 10-20 m2):
r/ps…………………………………… 0.04 0.09 0.16 0.20 0.30
a , mol/kg…………………………… 2.20 2.62 2.94 3.11 3.58

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