## Chemical Formulas and Mass Calculations

This page is an exercise in mass calculations based on the formula of
a chemical compound.
#### Usage

- To begin, press "New Problem" and a formula will appear in the left cell. Also,
a value will appear in one of the remaining three cells, corresponding to the mass
of that particular item in the sample.
- Enter the correct masses in the remaining two cells and press "Check Answer."
- The results and running totals appear in the second table.
- If your answer is incorrect, you should redo it and resubmit the new answer.
- If you miss a problem three times, pressing the "Show Answer" button will cause the correct answer to appear.