27. Solving a chemistry problem
38. When analyzing a sample of silicate 0.8617 g, mixtures of potassium and sodium chlorides weighing 0.2156 g were obtained. Potassium was precipitated from this mixture in the form of potassium perchlorate, the mass of which turned out to be 0.3112 g. Calculate the mass fraction of potassium and sodium oxides in silicate.
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