This page is an exercise in mass calculations based on the formula of
a chemical compound. To begin, press "New Problem" and a formula will appear in the left cell
and a value will appear in one of the remaining three cells. The compounds
are relatively simple, containing only C and H. In the solution presentation, "H(formula)" represents the mass of H per mole of compound while "H mass" is the mass of H in the current sample. Enter the correct masses in the remaining two cells and press "Check Answer." The results and running totals appear in the second table. Pressing "Show Answer" will cause the correct answer to appear and you will no longer be able to submit an answer for that problem.