Determine the surface excess (kmol/m2) for aqueous solutions of phenol at 20°C based on the given values of surface tension:

Phenol concentration, kmol/m3 0.0156 0.0625
Surface tension, N/m 58.2*10-3 43.3*10-3
σ of water (20 C) = 72.75*10-3N/m

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