An isotope of sodium, "Na, has a half-life of 15 hours. A sample of this isotope has mass 5 g. (a) Find the amount remaining after SD hours. 9 (b)...

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An isotope of sodium, “Na, has a half-life of 15 hours. A sample of this isotope has mass 5 g. (a) Find the amount remaining after SD hours.9 (b) Find the amount remaining after t hours. (c) Estimate the amount remaining after 5 days. (Round your answer to three decimal places.)9 (d) Use a graph to estimate the time required for the mass to be reduced to 0.01 9. (Round your answer to one decimal place.)hr