How do we really determine the exponent in rate law?

[Smooth Operater]

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given the rxn

2AB --> 2A + 2B

does r = [A]^2*^2 ? How do we really determine the exponent in rate law? Do we always looking at the coefficient in the rxn? Or deterined from experiment?

Can anyone clear it up? Thanks!

 

[aranjuez]

It's determined experimentally. You can't determine it from the simple reaction that's given.

aranjuez