What molar quantity is present in a #0.5*mL# of #5.0*mol*L^-1# acetic acid?
Do you realize what you have asked....?
You have just asked .................
You might want the number of moles of acetic acid contained in such a volume....and in that case, since.....
Maybe: 100 mL
I don't think you ignore that "ml" in "0.5 ml" is the measure of volume. In this case, you don't want to search for the volume you already know.
As you mispelled "acitic" instead of acetic, your question makes sense if you also mispelled "ml" instead of "mol".
Thus, let us assume the right question is "How to find volume of 0.5 mol of 5M of acitic acid?
5M means 5 moles of acetic acid per liter of solution. If you want 0.5 moles, that is one tenth of 5 moles, you will take just one tenth of one liter, i.e. 0.1 L = 100 mL of that solution.