Units  [ENDORSED]


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Ryan Neis 2L
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Units

Postby Ryan Neis 2L » Fri Mar 09, 2018 1:03 pm

What are the units for zero, first, and second-order reactions?

Andy Nguyen 1A
Posts: 56
Joined: Thu Jul 27, 2017 3:00 am

Re: Units

Postby Andy Nguyen 1A » Fri Mar 09, 2018 1:24 pm

The unit for k in a 0 order reaction is mol/(L*s). In a first order reaction, k is in 1/s. In a second order reaction, k is L/(mol*s).

Katie Lam 1B
Posts: 52
Joined: Fri Sep 29, 2017 7:06 am

Re: Units

Postby Katie Lam 1B » Fri Mar 09, 2018 1:53 pm

The units for the rate constant changes depending on the order of reaction, but the rate itself is always in mol/(L*s).

Justin Folk 3I
Posts: 43
Joined: Wed Sep 21, 2016 2:56 pm

Re: Units

Postby Justin Folk 3I » Fri Mar 09, 2018 2:20 pm

What about units for a 1.5 order?

Seth_Evasco1L
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: Units

Postby Seth_Evasco1L » Fri Mar 09, 2018 2:37 pm

Units of k for a reaction order of 1.5 would most likely have units of L0.5*mol-0.5*s-1.

Liz White 1K
Posts: 35
Joined: Thu Jul 13, 2017 3:00 am

Re: Units  [ENDORSED]

Postby Liz White 1K » Fri Mar 09, 2018 3:08 pm

As a general formula to calculate the units of the rate constant for any reaction order n, you can use the equation:

units of k = (L/mol)n-1 / s


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