Page 1 of 1

Units of Reaction Rate

Posted: Thu Feb 22, 2018 4:25 pm
by Jeremiah Samaniego 2C
Are the units of concentration of reactant or product (i.e. mol / L) included when finding the reaction rate?

Re: Units of Reaction Rate

Posted: Thu Feb 22, 2018 5:51 pm
by Tanaisha Italia 1B
Yes, because the rate is just a constant multiplied by the change in concentration over the change in time.
Concentration = mol/L
Rate = mol/(L* seconds)

Re: Units of Reaction Rate

Posted: Mon Feb 26, 2018 3:32 pm
by Ramya Lakkaraju 1B
Yes, you should not ignore the units of anything when using equations because the units must make sense in the final answer.

Re: Units of Reaction Rate

Posted: Mon Feb 26, 2018 4:28 pm
by Michelle Nguyen 2L
Yup; knowing that the rate has units (mol/L*s) tells you what units you should use for k, the rate constant. For example, the rate constant for a first order reaction has units (1/s) while the rate constant for a third order reaction Rate= k[A]^3 has units L^2/(mol^2 *s). ( [A] has units mol/L)

Re: Units of Reaction Rate

Posted: Tue Feb 27, 2018 10:54 pm
by Adrian Lim 1G
Yes, you should have units to see which units you need for k. Also, it is wise to always make sure to include units; even if it isn't necessary, it's nice to double check certain terms and values.

Re: Units of Reaction Rate

Posted: Tue Feb 27, 2018 11:27 pm
by Wayland Leung
Are there any constants we need to use in this unit?

Re: Units of Reaction Rate

Posted: Wed Feb 28, 2018 9:26 pm
by snehabhargava
we do not need to know any constants for this test

Re: Units of Reaction Rate

Posted: Wed Feb 28, 2018 9:42 pm
by Meredith Steinberg 2E
We will use gas constant, R, when we talk more about activation energy and its relationship to k and A.