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5. The best-known example of first-order kinetics is radioactive decay. Suppose you have
ordered a sample of Na3PO4 containing the radioactive isotope 32P (t1/2 = 14.3 days).
(a) Determine the rate constant (in days ¹) for the decay process.
(b) If the shipment is delayed for 10 days, what fraction of the original radioactive sample
will still be present when it arrives?

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