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Ch.2 - Atoms & ElementsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch.17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
The Atom
Subatomic Particles
Atomic Mass
Periodic Table: Classifications
Periodic Table: Group Names
Periodic Table: Representative Elements & Transition Metals
Periodic Table: Element Symbols
Periodic Table: Elemental Forms
Periodic Table: Phases
Periodic Table: Charges
Calculating Molar Mass
Mole Concept
Law of Conservation of Mass
Law of Definite Proportions
Atomic Theory
Law of Multiple Proportions
Millikan Oil Drop Experiment
Rutherford Gold Foil Experiment
Additional Guides
Periodic table Charges (IGNORE)
Periodic table Charges (IGNORE)
Calculating Grams to Moles (IGNORE)

The Mole Concept involves the interconversions between different unit amounts of a substance.

Mole Concept

Concept #1: Mole Concept

Mole connects together atoms, ions, molecules and formula units.

Example #1: Which of the following compounds would not be associated with the term “formula unit”?

Concept #2: Converting between Moles and Particles

Converting between moles and particles requires Avogadro's Number: 1 mole = 6.022x1023 particles.

Example #2: How many moles of chlorine gas are there in 8.33 x 1037 molecules?

Concept #3: Converting between Mass and Moles

Example #3: How many grams of chlorine gas are there in 2.34 moles?

Example #4: How many grams of Clcontain 9.25 x 1024 molecules of Cl2?

Mole also serves to connect mass units to particles.

Practice: If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?

Practice: Calculate the number of oxygen atoms found in 783.9 g NiCl2 • 6 H2O.

Practice: If the density of water is 1.00 g/mL at 25°C, calculate the number of water molecules found in 1.50 x 103 µL of water.

Practice: A cylindrical copper wire is used for the fences around a house. The copper wire has a diameter of 0.0750 in. How many copper atoms are found in 5.160 cm piece? The density of copper is 8.96 g/cm3. (V = π • r2 • h)