First slide

First order reactions

Question

The reaction, A→B follows first order kinetics. Initial concentration of ‘A’ is 16 M. Concentration of ‘A’ after 600 minutes will be (Half life period of the reaction =100 minutes)

Moderate

A

2 M
B

1 M
C

0.5 M
D

0.25 M

Solution

$Amount left, (a - x) = \frac{Initial amount (a)}{2^{n}}; n = number of half lives; n = \frac{600}{100} = 6; (a - x) = \frac{16}{2^{6}} = 0.25 M;$

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