Empirical Formulas from % composition
To begin-press "New Problem" and a question will appear to the right of the table
Determine the empirical formula and follow the instructions for submitting your results.
The results on the problem and a running total will appear in the main table. Note that "correct" answer is the one with the smallest integer coefficients.
If you get a problem "incorrect", you should redo it and recheck your
answer.
If you miss a problem three times, pressing the "Show Answer" button will cause a complete solution to appear.