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Radioactive substances decay by first-order kinetics. Explain how many hours would be required for a sample containing sodium-24 to decrease to 50.04% of its initial activity? Explain the half-life of sodium-24 is 1.50e1 hours.

NO2 at 383°C decomposes to form NO as well as O2 according to second order kinetics see reaction below. Explain the half-life for this reaction was measured to be 9.65e1 s when the initial concentration of NO2 was 2.16e-3 M. Explain what is the rate constant for this reaction?

2NO2(g) ? 2NO(g) + O2(g)

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