First slide

First order reactions

Question

For a first order reaction, rate constant is 6.93 $\times$ 10^-4 min^-1. $t_{75 %}$ of the reaction is ------- minutes

Moderate

A

2
B

20
C

200
D

2000

Solution

$For a first order reaction, t_{\frac{1}{2}} = \frac{0.693}{K}; t_{\frac{1}{2}} = \frac{0.693}{6.93 \times 10^{- 4} \min^{- 1}} = 1000 minutes; t_{75 %} = 2 t_{\frac{1}{2}} = 2000 minutes;$

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