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JAMB Chemistry 2024 Paper

Question : 45

Total: 138

^{-3}

^{-1}

Solution:

Concept:

For a first-order reaction, the half-life is independent of initial concentration and is given by

t_{1/2} = \frac{0.693}{k}

Explanation:

The rate constant is given as

k = 4.5 \times 10^{-3} \, \text{sec}^{-1}

Substitute this value into the half-life formula:

t_{1/2} = \frac{0.693}{4.5 \times 10^{-3}}

t_{1/2} = \frac{0.693}{0.0045}

t_{1/2} = 154 \, \text{seconds}

Answer:

The half-life is

154 \, \text{s}

, so the correct option is A.

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