2. Using the nitrogen adsorption isotherm at 77 K, calculate the specific surface of the adsorbent if the area occupied by one nitrogen molecule is S0 = 0.162 nm2.
P / Ps 0.03 0.05 0.11 0.14 0.20
A, mol / kg 2.16 2.39 2.86 3.02 3.33
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