a. If the surface excess is 3.37 x 10^-6 N/m, what is the area occupied by one surfactant molecule?

b. What is the surface tension, in dynes/cm, of a solution that rises 2.71 cm into a capillary tube with a 0.718 cm diameter above the level of a liquid reservoir?

c. A plot of the surface tension versus the natural logarithm of the concentration of the solute yields a straight line with a slope of 0.01469 N/m at 290 K. What is the surface excess, in mol/m²?