1. Adsorption of a surfactant dissolved in water on the surface of mercury-water obeys the Langmuir equation. At a surfactant concentration of 0.2 mol/l, the degree of surface filling is 0.5. Calculate the surface tension of mercury at the boundary with the solution at 298 K and the surfactant concentration in the solution is 0.1 mol/l. The limiting value of the area occupied by a surfactant molecule on the surface is S0=0.2 Nm2, the surface tension of mercury at the boundary with water is 0.373 J/m2.

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