Reaction Order


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Bianca Barcelo 4I
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Joined: Fri Sep 28, 2018 12:17 am
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Reaction Order

Postby Bianca Barcelo 4I » Tue Mar 05, 2019 11:59 pm

How does the reaction order affect the units of rate laws?

MaanasO 1A
Posts: 72
Joined: Fri Sep 28, 2018 12:26 am

Re: Reaction Order

Postby MaanasO 1A » Wed Mar 06, 2019 6:43 am

The final output should have the units M/s. So if you have higher than a 1st order reaction, you'll have extra M multiplied together => the k will have multiple 1/M to cancel everything out.

Clarissa Cabil 1I
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

Re: Reaction Order

Postby Clarissa Cabil 1I » Wed Mar 06, 2019 9:22 am

Given reaction A --> B (concentrations are in mol.L-1 and time is in s)

If this reaction is a zero order reaction, the units for its rate constants should be (mol A).L-1.s-1

If this reaction is a first order reaction, the units for its rate constants should be s-1

If this reaction is a second order reaction, the units for its rate constants should be L.(mol A)-1.s-1

Hope this helps!

Lia Inadomi 1I
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: Reaction Order

Postby Lia Inadomi 1I » Wed Mar 06, 2019 11:58 pm

A general formula can be M^(1-p)*s^-1, where p is the overall order of the reaction.

Casandra
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: Reaction Order

Postby Casandra » Thu Mar 07, 2019 12:15 am

For a zero order rate the units are mol/L*s
For a 1st order rate the units are 1/s
For a 2nd order rate the units are L/mol*s


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