A sample weighing 0.5742g contains potassium. Potassium is then precipitated as perchlorate, KClO4, whose weight is 0.42

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answerhappygod
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A sample weighing 0.5742g contains potassium. Potassium is then precipitated as perchlorate, KClO4, whose weight is 0.42

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A sample weighing 0.5742g contains potassium. Potassium is then precipitated as perchlorate, KClO4, whose weight is 0.4240g. What is the percentage concentration of potassium in the sample?
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