18. Using the BET equation, calculate the specific surface area of the adsorbent from the benzene adsorption isotherm at 298 K. Take the area occupied by a benzene molecule to be 0.49 nm2.
P/Ps 0.01 0.05 0.10 0.15 0.20
A, mol/kg 1.67 3.16 3.67 4.06 4.26

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