different units

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Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

different units

Postby Katie Bart 1I » Thu Mar 05, 2020 10:57 pm

Why are the units different in first, second, etc. ordered reactions?

Aiden Metzner 2C
Posts: 104
Joined: Wed Sep 18, 2019 12:21 am

Re: different units

Postby Aiden Metzner 2C » Thu Mar 05, 2020 11:02 pm

Each different ordered reactions involve having the concentrations be increased to certain powers. ^2 for second order. Therefore the units are changed by that order as well.

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: different units

Postby EvanWang » Thu Mar 05, 2020 11:03 pm

It is because you want the right units in the end when you multiply everything to find the rate using the differential or integrative rate law. In a reaction with an overall order of 4 for example, you will have the unit of mol/L multiplied by itself 4 times, so the units of k must be different so that the rate is in moles per liter per second.

Maya Pakulski 1D
Posts: 105
Joined: Thu Jul 11, 2019 12:17 am

Re: different units

Postby Maya Pakulski 1D » Fri Mar 06, 2020 5:03 pm

The units of k specifically in different order reactions are
zero-order M/s
first-order 1/s
second-order 1/M*s

Mitchell Koss 4G
Posts: 128
Joined: Sat Jul 20, 2019 12:17 am

Re: different units

Postby Mitchell Koss 4G » Tue Mar 10, 2020 12:28 pm

k=rate/[A]

rate=M/s
[A]=M


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