First slide

First order reactions

Question

$A \to$ products, follows first order kinetics. ${\frac{3}{4}}^{th}$ of the reaction is completed in 90 minutes. Half life of the reaction is

Easy

Solution

$\begin{array}{l} t_{75 %} = 2 t_{50 %} \\ t_{50 %} = \frac{90}{2} = 45 \min \end{array}$

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