3. The following surface tension values were measured for the aqueous solution of a non-ionic surfactant...

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3. The following surface tension values were measured for the aqueous solution of a non-ionic surfactant CH3(CH2)9(OCH₂CH2)5OH at 25 °C. CSAA (X 104 mol-dm-³) y (mN-m-¹) 0.1 69.9 0.3 1.0 56.2 47.2 2.0 41.6 5.0 34.0 8.0 30.3 10 29.8 Graphically determine the c.m.c. and also the area per molecule at the c.m.c. of the non-ionic surfactant CH3(CH₂),(OCH₂CH₂)5OH at 25 °C using the data given in the table above. 20 29.6 3. The following surface tension values were measured for the aqueous solution of a non-ionic surfactant CH3(CH2)9(OCH₂CH2)5OH at 25 °C. CSAA (X 104 mol-dm-³) y (mN-m-¹) 0.1 69.9 0.3 1.0 56.2 47.2 2.0 41.6 5.0 34.0 8.0 30.3 10 29.8 Graphically determine the c.m.c. and also the area per molecule at the c.m.c. of the non-ionic surfactant CH3(CH₂),(OCH₂CH₂)5OH at 25 °C using the data given in the table above. 20 29.6