Half life constant and Rate reaction constant


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Ardo 2K
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

Half life constant and Rate reaction constant

Postby Ardo 2K » Sun Mar 04, 2018 5:32 pm

When we find the constant K for a reaction from the half life equation can we apply that same constant to the second order reaction equation to find the concentration of a given reactant?

Ozhen Atoyan 1F
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Joined: Thu Jul 27, 2017 3:01 am
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Re: Half life constant and Rate reaction constant

Postby Ozhen Atoyan 1F » Sun Mar 04, 2018 6:37 pm

If you use the second order half life formula then you can use that k in the second order reaction to find the concentration. There are different half life formulas depending on if its zero, first, or second order.

Luis De La Cruz 1H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Re: Half life constant and Rate reaction constant

Postby Luis De La Cruz 1H » Sun Mar 04, 2018 8:46 pm

Like stated above, each K constant that you derive will be different, depending on the order of the reaction (0,1, or 2) because each order has its own half life formula associated with it.

DamianW
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Half life constant and Rate reaction constant

Postby DamianW » Sun Mar 04, 2018 8:47 pm

So order does matter ?

Phi Phi Do 2E
Posts: 27
Joined: Fri Sep 29, 2017 7:05 am

Re: Half life constant and Rate reaction constant

Postby Phi Phi Do 2E » Sun Mar 04, 2018 10:46 pm

yes, order does matter when you are solving for k. That is why the units differ for the k value in each rate order.


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