138. Solving a chemistry problem

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138. Solving a chemistry problem

5. Find the surface activity of pelargonic acid (С8Н17СООН) at 100C and a concentration of its solution of 50 mg / dm3, if the surface tension of the acid solution is 57.010-3 n / m, water 74.2210-3 n / m, and the initial concentration of the solution is zero.

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