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4. The radioactive isotope 55Fe has a half-life of 2.73 years. (a) What is the rate constant for this first-order reaction? (b) What fraction of

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4. The radioactive isotope 55Fe has a half-life of 2.73 years. (a) What is the rate constant for this first-order reaction? (b) What fraction of the isotope remains after 5 years? Assume 3 significant figures in your calculations

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