Chapter 10

Molar Calculations

Moles are extremely important to many chemical calculations. Sometimes you need to find moles, and in other cases, moles are necessary to find something else. The molar mass is useful to convert mass to moles or to convert moles to mass. Converting moles to mass is useful in determining the percent composition and percent yield. Converting mass to moles is useful in determining empirical and molecular formulas and in finding the limiting reactant.

The Problems You’ll Work On

In this chapter, you work with molar calculations in the following ways:

Calculating molar mass

Finding percent composition

Writing empirical and molecular formulas

Completing molar calculations

Finding the percent yield

Working with limiting reactants

Note: For access to the periodic table, see the Appendix.

What to Watch Out For

Remember the following when working on molar calculations: ...