4. Below are data on the adsorption of water vapor by macroporous silica gel. Using Langmuir's equations, determine the capacity of the adsorption layer in mol/kg. The volume of adsorbed water vapor is reduced to normal conditions:
P, Pa 6.0 9.2 15.0 23.0 28.3 33.8
A, mol/kg 0.52 0.68 1.05 1.23 1.51 1.84

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