The following surface tensions were measured for aqueous solutions of the non-ionic surfactant CH3(CH2)9(OCH2CH2)5OH at 25°C. Conc./10-4 mol L-1 Y/mN m-1 0.1 0.3 1.0 2.0 5.0 8.0 10.0 20.0 30.0 63.9 56.2 47.2 41.6 34.0 30.3 29.8 29.6 29.5 Determine the critical micelle concentration and calculate the area occupied by each adsorbed surfactant molecule at the critical micelle concentration. (9 × 10-4 mol L-¹, approx. 4 × 10–19 m²)