Calculate the surface tension of hexane at t=20°C if the following data were obtained by drop counting: the number of drops of hexane is 65, the number of drops of water is 25. The density of hexane is 0.6595 g/ml, the density of water is 0.9982 g/ml. The surface tension of water at t=20°C is 72.75•10-3 J/m2.

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