77 Решение задачки по химии №07 713

28. The service life of steel drainage pipes with a total area of 105 m2, corroding in marsh soil at a rate of 10 g/m2 per year, is 20 years. What is the rate of corrosion? How much zinc (by weight) should be taken for the tread protection of pipes in order to increase their service life by 2 times?

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