20. When measuring nitrogen adsorption on activated carbon at 273 K, the following data were obtained:
A, cm3/g 0.987 3.04 5.08 7.04 10.31
R, mm. rt. Art. 3.93 12.98 22.94 34.01 56.23
Show that adsorption obeys the Freundlich equation and find the graphical constants of this equation.

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