units


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megangeorge-1K
Posts: 59
Joined: Thu Feb 01, 2018 3:01 am

units

Postby megangeorge-1K » Sat Mar 16, 2019 9:25 pm

what is the units of k for a second order reaction

Danielle Hoekstra 1C
Posts: 30
Joined: Tue Oct 02, 2018 12:15 am

Re: units

Postby Danielle Hoekstra 1C » Sat Mar 16, 2019 9:27 pm

1/Msec

Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Re: units

Postby Priscilla Okaiteye » Sat Mar 16, 2019 9:28 pm

that would be m^-1t^-1

kristi le 2F
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: units

Postby kristi le 2F » Sun Mar 08, 2020 6:40 pm

fYou can always solve the units for k by dividing the units for rate (mol x L^-1 x s^-1) by the units of your concentrations (which depend on the order of the reaction).

Sofia Barker 2C
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

Re: units

Postby Sofia Barker 2C » Wed Mar 11, 2020 2:12 pm

The units of k are L/(mol x seconds) for a second-order reaction.
You can solve for the units through the equation rate = k[concentration]^2.
k = rate / [concentration]^2
k = mol/(L x seconds) / (mol/L)^2
k = (mol / Ls) x (L^2 / mol^2)
k = L / mol S, which can be written as 1/(M x s), M being molarity

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

Re: units

Postby Christine Honda 2I » Wed Mar 11, 2020 2:21 pm

You can always solve for the units by knowing the rate reaction equation (rate=k[A]^2) and solving for k!


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