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JamesAntonios 1E
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Joined: Fri Sep 29, 2017 7:04 am


Postby JamesAntonios 1E » Sat Mar 03, 2018 3:20 pm

For a, because the reaction is 2A-->B + C, why isn't there a 2 in the reaction. If we are solving the differential rate law -1/2 d[A]/dt=k[A]^2, we get -1/2 d[A]/[A]^2= kdt. If we multiply the 2 to the other side, we are left with -d[A]/[A]^2=2kdt. If we integrate both sides, we get 1/[A]=2kt + 1/[A]o. However, the answer key does not use this equation. Why not, please?

Alyssa Parry Disc 1H
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Joined: Sat Jul 22, 2017 3:01 am

Re: 15.39a

Postby Alyssa Parry Disc 1H » Sat Mar 03, 2018 10:57 pm

I'm not quite sure why they don't use that specifically but I am pretty sure that coefficients don't really affect anything

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Re: 15.39a

Postby rkusampudi » Sun Mar 04, 2018 12:28 am

Perhaps because it is looking at the concentration and not the number of moles.

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Re: 15.39a

Postby miznaakbar » Sun Mar 04, 2018 12:24 pm

In lecture when we derived the differential rate law for second order reactions, we assumed a=1. For our purposes, it seems like they want us to assume that the coefficients do not affect the reaction (like the solutions manual shows), though I'm not really sure why they would not want us to take coefficients into account.

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