Question 1
At a given temperature, a first-order reaction has a rate constant of 1.5 × 10–3 s–1. The time required for the reaction to be 32% completed is
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13 min◦
1.9 min◦
47 min◦
4.3 min◦
39 minQuestion 2
At a particular temperature, N2O5 decomposes according to a first-order rate law with a half-life of 3.0 s. If the initial concentration of N2O5 is 1.0 × 1016 molecules/cm3, what will be the concentration in molecules/cm3 after 15.5 s?
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2.8 × 1014
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3.3 × 101
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1.0 × 1016
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1.5 × 1014
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2.3 × 10–1