First slide

First order reactions

Question

For a first order reaction, rate constant is 6.93 $\times$ 10^-2 min^-1. $t_{99.9 %}$ of the reaction is ------- minutes

Moderate

A

10000
B

10
C

1000
D

100

Solution

$For a first order reaction, t_{\frac{1}{2}} = \frac{0.693}{K}; t_{\frac{1}{2}} = \frac{0.693}{6.93 \times 10^{- 2} \min^{- 1}} = 10 minutes; t_{99.9 %} = 10 t_{\frac{1}{2}} = 100 minutes;$

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