J1: UNIT J OUTLINE: Moles, Percentage Compostion, and Empirical and Molecular Formulas
TOPICS:
OBJECTIVES:
This unit is designed to give you an understanding of:
 Applicable chemistry math units including:
Gram-atomic weight or mass
Gram molecular weight or mass
Gram formula weight or mass
 Mole concept
 Percentage composition
 Empirical and Molecular Formula Determination from quantitative analysis
data
Upon completion of this unit, you will be expected to:
1. determine the number of atoms in the formula of any compound,
2. determine the formula mass of any compound, including hydrates,
3. define gram-atomic and gram-formula/molecular mass,
4. state the relationship between a mole, its corresponding gram-atomic or gramformula/molecular mass and the number of units (atoms, molecules, etc.),
5. determine the percentage composition of a compound from the chemical
formula or quantitative analysis data,
6. determine the empirical and/or molecular formula from quantitative analysis
data.
FRAMEWORK STRANDS:
CHEMISTRY
LEARNING STANDARDS:
CHEMISTRY: CH.1 f, g; CH.3 c
CLASSROOM
HANDOUT
MATERIALS
VOCABULARY/
CONCEPTS/
SCIENTISTS
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
J1-8
J1-9
J1-10
J1-12
J1-13
J1-14
J1: UNIT OUTLINE
B2: PERIODIC TABLE
J2: UNIT STUDY GUIDE/PRE-TEST
J3: COUNTING ATOMS/FORMULA MASS WORKSHEET
J4: PRACTICE PROBLEMS WORKSHEET
J5: Supplemental Problems Worksheet
J6: Unit J Reading Notes
J7: LAB: Water Content of a Hydrate
You are expected to be thoroughly familiar with the following. You will find
definitions, explanations, and information about these in your textbook (reference
sections are noted). They will also be explained, discussed, and illustrated through
classroom and lab activities.
quantitative analysis (Unit J Reading Notes)
qualitative analysis (Unit J Reading Notes)
empirical formula (Unit J Reading Notes)
Molecular formula (Unit J Reading Notes)
formula mass (Unit J Reading Notes)
molecular mass (Unit J Reading Notes)
gram atomic mass (molar mass) (Unit J Reading Notes)
gram molecular mass (Unit J Reading Notes)
gram formula mass (Unit J Reading Notes)
mole (10.1)
representative particles of elements, and ionic and molecular compounds (10.1)
Avogadro’s number (10.1)
mass—mole—atom calculations for elements (10.1)
Please turn the page 
J1: UNIT J OUTLINE
J2-1
J2-2
J2-3
J2-4
J3-1
J3-2
J3-3
J4-1
J4-2
J4-3
page 2
particles of a compound: formula units and molecules (10.1 [Table 10.1], Unit J
Reading Notes)
determining molar mass of a compound from its chemical formula (10.1)
using molar mass of a compound to generate a three- or four-part equivalency (10.2)
using a four-part equivalency to do mole-mass-particle-volume calculations (10.2)
determining percentage composition of a compound from its formula (10.3)
determining percentage composition of a compound from quantitative analysis data
(10.3)
percent composition as a conversion factor (10.3)
determining empirical formula of a compound from sample mass data (Unit J Reading
Notes)
determining empirical formula of a compound from percentage composition data
(10.3, Unit J Reading Notes)
determining molecular formula of a compound given the empirical formula and
molecular or molar mass of the compound (10.3, Unit J Reading Notes)
EVALUATION:
ASSIGNMENTS:
I-1
Reading:
Written:
You will be evaluated via the following:
 Daily homework quizzes based on reading and written assignments
 Unit Test—covers all objectives stated above.
10.1 (through page 294)
p. 291: PP # 3, 4
p. 315: #48, 52 (a), 58 (f), 59 (f)
I-2
Reading:
Written:
10.1 (pp. 295-296), 10.2
Supplemental Problem Worksheet (I5): #1, 2, and 3
p. 315: # 60 (b), 62 (a)
I-3
Reading:
Written:
10.3 (through page 308)
Practice Problems in Packet: # 1, 3, 5;
Supplemental Problems Worksheet # 4-7
In Text: p.315: #63 (a), 63( b)
I-4
Reading:
Written
10.3 (pp.309-312), Unit I Reading Notes
A: Practice Problems in Packet: # 6-10
B: Supplemental Problems Worksheet in Packet: # 8-13