Khan Academy http://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiometry/v/stoichiometry (Careful - he is rounding the mass values - I don't want you to round.)
Educator.com You'll have to know what molarity is to do this one...(and we will, soon!) There are other videos by this guy too; he has a different tone than the first video, but he is helpful. He does his steps one at a time which is different than how we do it (all in one line) but the answers will be the same. http://www.youtube.com/user/EducatorVids2?v=zoazi3pJVyE
SECRET EXTRA CREDIT: If you happen to be viewing my page, look up what a "limiting reagent" problem is. Find a video, watch it, and submit the URL for extra credit! SECRET EXTRA CREDIT 2: If you happen to be viewing my page, look up what "molarity." Find a video, watch it, (or a link and view it) and submit the URL for extra credit!
Sorry! These two opportunities have expired! But by now, you should know what they are!