The surface tension of an aqueous solution of a surfactant decreases linearly with nerease m concentration of the surfactant. if the surface tension of 2% solut

The surface tension of an aqueous solution of a surfactant decreases linearly with nerease m COncentration of the surfactant. If the surface tension of 2% solution of the surfactant is 0.068 Nm at 25"C and the surface excess concentration at this concentration is 20 * 10 gCm calculate the molar mass of the surfactant. Given:y*= 0.072 Nm onal cas low Calculate the