**a. Mole calculations**

· Calculate molecular weight

· Calculate the percent composition of each element in the molecule

· By entering the formula and any of the three quantities (mass, number of moles, or number of molecules), you can calculate the other two quantities.

**b. Empirical and Molecular Formulas**

· Calculate the empirical formula of a compound by providing the percentage compositions of each element in a molecule, or masses of each element in a sample

· Calculate the molecular formulas if the molecular weight is known

**c. Stoichiometric calculations of any given reaction**

· Balance the equation for the reaction

· Can convert masses to moles.

· Convert from moles back to grams using molecular weights.

· Use the balanced equation to set up the appropriate mole ratios

· Use the mole ratios to calculate the number of moles of the desired reactant or product

· Find the limiting reagent

**d. "Show Work" page displays side-by-side with the solution in explaining how the problem has been solved.**