400. From 400 g of a 20% (by weight) solution, 50 g of dissolved substance was released upon cooling. What is the mass fraction of this substance in the remaining solution?

Read the product description. After payment, the system will redirect you to a page with a ready-made solution to problem 400 from the collection: Glinka N.L. Problems and exercises in general chemistry. Textbook for universities / Ed. V.A. Rabinovich and Kh.M. Rubina. – 23rd ed., revised. – L.: Chemistry, 1985. – 264 p., ill. The solution is a document formatted in MS Word.
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