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# Mole Concept

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Sections
Empirical Formula
Molecular Formula
Calculating Molar Mass
Mole Concept
Mass Percent
Stoichiometry
Limiting Reagent
Percent Yield

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)

Practice: The density of the sun is 1.41 g/cm3 and its volume is 1.41 x 1027 m3. How many hydrogen molecules are in the sun if we assume all the mass is hydrogen gas?