1. Topic 3 The Mathematics of Formulas and Equations
Midterm Review
Topic 3
The Mathematics of Formulas and Equations

2. Vocabulary
Formula Mass
Gram Formula Mass
Mole
Percentage Composition

3. Formula Mass
The mass of the smallest unit of the compound is the formula mass
also called molecular mass
Measured in amu

4. Gram Formula Mass
The gram formula mass of a substance is simply the formula mass expressed in grams instead of amu
Also called gram molecular mass

5. Percent Composition
The percent composition of a substance represents the composition as a percentage of each element compared to the total mass of the compound

6. The Mole
A mole is defined as the number of atoms of carbon present in 12 grams of C-12.
The number of particles in a mole of a substance is x 1023
This is called Avogadro's number

7. Converting between grams and moles

10. Finding Molecular and Empirical Formulas

11. Mole Relationships in Balanced Equations

12. Mole Relationships in Balanced Equations
The coefficients represent both the basic unit and the mole ratio in balanced chemical equations