Unit Chemical Quantities: The Mole - Wksh #1

Mole Conversions

• Moles measure the amount of substance, related to the number of atoms or molecules using Avogadro's number (6.02 x 10^23).

Calculating Moles from Atoms

• 1.24 x 10^24 atoms of sulfur equals approximately 1.99 moles.
• To calculate moles, divide the number of atoms by Avogadro's number.

Calculating Atoms from Moles

• 1.5 moles of helium correspond to 9.03 x 10^23 atoms.
• Total atoms can be found by multiplying moles by Avogadro's number.

Mole Calculations with Molecules

• 4.15 x 10^23 molecules of carbon monoxide equal about 0.69 moles.
• Use the formula: Moles = Number of molecules / Avogadro's number.

Molecules from Moles

• 2.25 moles of sulfur dioxide yield approximately 1.35 x 10^22 molecules.
• Multiplication of moles by Avogadro's number helps find total molecules.

Sodium Chloride Units

• 2.4 x 10^23 formula units of sodium chloride equate to roughly 0.39 moles.

Magnesium Iodide Calculations

• 1.8 moles of magnesium iodide corresponds to about 1.08 x 10^24 formula units.

Potassium Permanganate Moles

• Approximately 0.61 moles result from 3.67 x 10^23 formula units of potassium permanganate.

Carbon Tetrachloride Molecules

• 0.25 moles of carbon tetrachloride equal approximately 1.505 x 10^23 molecules.

Aluminum Atom Calculations

• 1.3 x 10^24 atoms of aluminum translate to about 2.16 moles.

Oxygen Difluoride Molecule Count

• 3.52 moles of oxygen difluoride yield around 2.12 x 10^24 molecules.