All roads go to moleville. Go to chadsvideos.com and look up his stoichiometry video. My advice is to learn everything by their units e.g. molarity is moles per volume. You can do dimensional analysis much faster and easier once you get all the units well memorized.
I watched Chad's video on it about 3 times in total until I full grasped the concept. Definitely recommended! No matter what, convert to moles & then go from there.