Reaction orders

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LNgo 1G
Posts: 100
Joined: Sat Aug 24, 2019 12:16 am

Reaction orders

Postby LNgo 1G » Wed Mar 11, 2020 12:49 pm

Are the stoichiometric coefficients always used as the order of the reactants?

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: Reaction orders

Postby Alex Tchekanov Dis 2k » Wed Mar 11, 2020 12:51 pm

No, only when you are looking at an elementary step or the rate determining step

Hailey Kim 4G
Posts: 110
Joined: Sat Jul 20, 2019 12:16 am

Re: Reaction orders

Postby Hailey Kim 4G » Wed Mar 11, 2020 12:58 pm

No, that is not always the case. A good example is homework problem 7A.15. The given reaction is 2A(g) + 2B(g) + C(g) ---> 2G(g) + 4F(g). Even though A has a coefficient of 2, the data shows that reactant A is first order.

Aarja Pavade 1H
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

Re: Reaction orders

Postby Aarja Pavade 1H » Wed Mar 11, 2020 1:09 pm

According to the book, the rate law (which can tell us the order of reaction) cannot in general be inferred from the chemical equation for the reaction. Thus, looking at stoichiometric coefficients are not a reliable way to determine the order of reactions.

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