89. Solving a chemistry problem
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89. Solving a chemistry problem
273. Determine the ability for spontaneous spreading over heptane of an aqueous solution of a quaternary ammonium salt of perfluoropelargonic acid, if the surface tension of heptane is 21.1 mN/m. the surface tension of a solution of a quaternary ammonium salt of perfluoropelargonic acid is 20.1 mN/m. interfacial tension at the interface between the surfactant solution and heptane is 3.1 mN/m.
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