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Answer the following.
For a given first order reaction, it takes 5 minutes for the initial concentration of to become …
For a given first order reaction, it takes 5 minutes for the initial concentration of $0\cdot6\text{ moles litre}^{-1}$ to become $0\cdot2\text{ moles litre}^{-1}$. Calculate the rate constant for this reaction.
Answer
Answer
Official answer key$k = \dfrac{2.303}{t}\log_{10}\dfrac{a}{a-x} = \dfrac{2.303}{5}\log_{10}\dfrac{0.6}{0.2} = \dfrac{2.303}{5}\times 0.477 = 0.2197\text{ min}^{-1}$
Final answer: 0.2197 min^-1
From ISC 2027 Specimen Chemistry Paper 1, question 13(i).
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