Rate equations

Can u pls answer this question ?

What are the units of the rate constant for a third order reaction ?

A mol dm-3 s-1
B mol -1 dm3 s-1
C mol2 dm-6 s-1
D mol-2 dm6 s-1


Thank you

I can’t give you the direct answer but hopefully you can work it out.

the equation for a third order reaction is:

rate = k x [concentration]^3

Note that rate is often mol dm-3 s-1

Concentration is mol dm-3, however here concentration is cubed so you will have to take that into account.

Now hopefully you can work out the units of k

Oh thank you. I think Ive worked it out. is it D could you pls tell me if im right?