Rate constant units

[Nicole Nikolov 1K]

What is a general rule of thumb to figure out the units of the rate constant and the initial rate? I'm having trouble figuring them out once we get past fourth order reactions...

[SPandya1F]

for first order, M/s
for second order, 1/s
for third order, 1/Ms
in general:

[Zane Mills 1E]

An easier way to think of it is just match up your concentrations and their exponents with the rate (which you know is M/s or mol/L*s)

[Phillip Tran]

write it all out and cancel whatever you can. whats left is your units

[Sarah Wax 1G]

Another thing I do is whatever the order is, the liters and moles will have an exponent one less than the order.

For fourth order, the rate constant = L^3/ mol^3 * S
For third order, the rate constant = L^2/ mol^2 * s
For second order, the rate constant = L / mol * s

[Jimmy Zhang Dis 1K]

In general the constant is M^1-n*time^-1

[jane_ni_2d]

It's helpful to just write all your units out and then see which ones cancel!