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In a chemical reaction, a certain compound changes into another compound at a rate proportional to the unchanged amount. There are 672 grams of the

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In a chemical reaction, a certain compound changes into another compound at a rate proportional to the unchanged amount. There are 672 grams of the original compound initially and 420 grams after 1 hour. When will 75 percent of the compound be changed? (Round your answer to two decimal places.) hr

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