for a first order reaction A-B, the rate constant is 0.0458 s-1 . calculate rate of the reaction if the concentration of reactant is 0.35mol dm-3
Correct answer: C. 0.016 mol dm-3 s-1
- A. 0.012 mol dm-3 s-1
- B. 0.014 mol dm-3 s-1
- C. 0.016 mol dm-3 s-1
- D. 0.018 mol dm-3 s-1
Explanation
For a first-order reaction, the rate of the reaction can be calculated using the following formula:Rate=k×[A]Rate=0.0458s−1 ×0.35mol dm−3Rate=0.01603mol dm−3 s−1
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Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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