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30. An isotope of sodium has a half life of 15 hours. A sample of this isotope has a mass of 2 grams. a) find

30. An isotope of sodium has a half life of 15 hours. A sample of this isotope has a mass of 2 grams. a) find the mass that remains after 5 hours b) How long will the sample take to decay to 0.4 grams vvVV vVV

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