21. Using the constants of the Shishkovsky equation: a = 21.12 * 10-3 and b = 42.0, calculate the surface tension of aqueous solutions of isoamyl alcohol at 273 K for the following concentrations (kmol / m3): 0.005; 0.020; 0.050; 0.100 and plot a curve in the coordinates b = f (C). The surface tension of water at this temperature is 72.75 x 10-3 N / m.

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