A solution of store bought vinegar will be provided. According to the label, vinegar is ~5% acetic acid by mass. You must first convert this concentration to M

Question

Help please!

Answer 1

I already answered this and told you that in order to do this PROPERLY, you will need the density of the vinegar solution. If you don't want to do it properly, and you just want to assume a density of 1 g/ml (when it is actually 1.06 g/ml) then here is how to calculate the molarity.
5% by mass = 5 g/100 g and assuming a density of 1 g/ml that is the same as 5 g/100 ml
5 g/100 ml = 50 g/liter
50 g/liter x 1 mole/60 g = 0.83 moles/liter = 0.8 M

Answer 2

If you want to convert 5% by mass acetic acid to M (molarity), you will need the density of the solution.

5% by mass = 5 g acetic acid/100 g solution

5 g acetic acid x 1 mole acetic acid/60.05 g = 0.033 moles acetic acid

Once you know the density of the solution, you can calculate the volume and then divided the moles acetic acid by the liters of solution to obtain M (moles/liter)