Calculations with Chemical Formulas

In a fashion similar to the "Reactions on the Fly" page, this page generates formulas for compounds on demand and then produces a question based on the category checked below. The compounds are both inorganic and organic and are supposed to be realistic, though some may be a bit "unusual". If you've come to this page in response to my request for "beta" testers, I thank you for your time. What I would like people to do is just execute the page as many times as you can tolerate and see whether it performs within general specs. The page, as currently set up will display both the question and the answer. The answer check is fully functional. There is an email link below for feedback, bug reports, criticisms, etc. Once the program is running properly, it will be available, like everything else here for anyone who wants to use it. Clicking on the circle in front of the problem type starts the execution.
Formulas from % Composition
% Composition from formulas
Calculate GFW
Moles to moles
Moles to grams
Grams to moles
Grams to grams
Results Total Done Total Correct
Feedback to George