Transcript Unit 9: The Mole

Unit 9: The Mole
REPRESENTATIVE PARTICLES &
PARTS TO MOLE CONVERSIONS
Review: What is a mole?
How many are in:
A pair?
Dozen?
Gross?
Ream?
What do these represent?
Review: What is a mole?
1 mole = 6.02 x 1023 particles
◦ Particles are representative units: (atoms, formula units, molecules)
This number is known as Avogadro's Number
◦ It is the number of particles whatever they may be: atoms, formula units,
molecules
Examples:
1. If I have a mole of apples, how many apples do I have?
2. A mole of marbles?
3. A mole of skittles?
Avogadro’s Number and Representative
Particles/Units
1 mole = 6.02 x 1023 ___units/particles____
The units/particles depends on what type of particle
it is:
◦Atoms (atms): individual elements
◦Formula Units (FU): Ionic Compounds
◦Molecules (molec): Covalent Compounds
Representative Particles:
◦Atoms (atms): individual elements
◦ These are individual elements
◦ H2, Cu, Na, Cl2
◦Formula Units (FU): Ionic Compounds
◦ These are compounds that begin with a cation, or metal.
◦ NaCl, CaCl2, AgNO3
◦Molecules (molec): Covalent Compounds
◦ These are compounds that begin with a nonmetal
◦ CO, H2O, N2O, AsC4
Identifying Types of Particles:
Substance
Sodium chloride
oxygen
Lithium phosphate
Dinitrogen pentaoxide
Gallium
Sulfur dioxide
Phosphorus trichloride
Potassium
Formula for substance:
Unit/Particle
Converting particles (parts) to moles:
How many atoms are in 2.54 moles of sulfur.
Given Unit_Conversion Factor_(New Unit)
Conversion Factor (given unit)
What is our conversion factor?
6.02 x 1023 particles (atoms, molecules, formula units)
2.54 𝑚𝑜𝑙𝑠 𝑆
𝑥
6.02 𝑥 10 23 𝑎𝑡𝑚𝑠 𝑆
1 𝑚𝑜𝑙 𝑆
= 1.53 x 1023 atms S
Practice Problems
Complete the following problems in
your notes.
How many atoms are in 6.2 moles of Al?
Convert 5.75 x
24
10
atoms of Al into mols
of Al.
How may atoms are in 3.5 moles of Si?
Convert 5.3 x
25
10
molecules of CO2 to
moles.
What does Avogadro put in his
hot chocolate?
Marsh-mole-ows!