Units for rate laws

Moderators: Chem_Mod, Chem_Admin

madisondesilva1c
Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

Units for rate laws

Postby madisondesilva1c » Mon Mar 04, 2019 7:53 pm

Should the convention of rate laws always include moles vs mmol? The textbook often gives mmol when giving concentration, but should we convert this to moles to stay in SI conventions?

Grace Kim 1J
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

Re: Units for rate laws

Postby Grace Kim 1J » Mon Mar 04, 2019 8:07 pm

The reaction rate units is usually in the form mol L^-1 s^-1 (the time unit varies - s, min, hr, etc). However, the rate constant, k, is determined by the using the rate law for the order of reaction and the unit of rates and concentration. For example, the first order reaction has rate=k[A], or k=rate/[A], so the units would be the unit of rate divided by the unit of concentration, which is (mol/L.s)/(mol/L)=s-1

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

Re: Units for rate laws

Postby Yvonne Du » Wed Mar 06, 2019 5:16 pm

It is not necessary, but make sure to keep the units constant.


Return to “Method of Initial Rates (To Determine n and k)”

Who is online

Users browsing this forum: No registered users and 2 guests