If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction? A. 0.033 s^-1 B. 0.046 s^-1 C. 0.023 s^-1 D. 43 s^-1

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Krystal Mullins

Chemistry

17 June, 04:40

If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction? A. 0.033 s^-1 B. 0.046 s^-1 C. 0.023 s^-1 D. 43 s^-1

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Dax Campbell · Answer 1

The answer is A. For a first-order chemical reaction, the rate constant k has a relationship with concentration C as follow: dC/dT=k*C. So in this reaction, (1-0.5) / 30=k*0.5. So k=0.033