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A first order reaction has a half life of 14.5 hours. What percentage of the reactant will remain after 24 hours?

A first order reaction has a half life of 14.5 hours. What percentage of the reactant will remain after 24 hours?

Grade:11

1 Answers

Arun
25750 Points
6 years ago
[A] = [Aº] x e^(-kt) 

first, find k 
half life = 0.693/k 
14.5hours = 0.693/k 
k = 0.048 

second, solve for [A] 
[A] = 1M x e^(-0.048 x 24) 
[A] = 0.316M 
31.6%

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