Including mol/L in K calculations

[EllerySchlingmann1E]

I know that K is not written with the units mol/L because of the use of concentration in place of activity for species, but I am wondering if we should include mol/L with the concentrations when writing out our K expression on the test and homework. Just not sure what the correct format/practice is in this case. Thanks for any help with this question!

[kamalkolluri]

As of what I saw in lecture, you just use the numbers because K has no units. So just don't include concentrations in the expression.

[Olivia L 4E]

To add to the previous reply, the brackets used when writing out the K equation indicate concentration so in doing that represents mol/L.