The Mole mole mol SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon12 A unit of counting like the dozen Avogadros Number ID: 550128
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Slide1
Molar Mass & ConversionsSlide2
The Mole
mole
(mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
A unit of counting, like the dozen.Slide3
Avogadro’s Number
Avogadro’s Number
- the number of particles in exactly one mole of a pure substance.
1 mole = 6.0221415 X 10
23
1 mol =
6.022 x 1023
Amedeo AvogadroSlide4
Atomic Mass
atomic mass
- the mass of one mole of an atom
Atomic mass is expressed in atomic mass units (amu) or (u) or g/mol.Can be found on the periodic table.All atomic masses are based on the atomic mass of carbon-12 being 12 amu.Slide5
Molar Mass
molar mass
- the mass of one mole of a pure substance.
Molar mass is written in units of amu or g/mol.Slide6
Atomic mass vs. Molar mass
atomic mass
- the mass of one mole of
an atom.molar mass - the mass of one mole of a pure substance.Slide7
Atomic Mass vs. Molar Mass
Example
Atomic Mass
Molar Mass
Na
Ag
C
O
22.99 g/mol
22.99 g/mol
107.87 g/mol
107.87 g/mol
12.01 g/mol
12.01 g/mol
16.00 g/mol
16.00 g/molSlide8
Molar Mass of Compounds
Compound
Molar Mass
H
2
O
C
6
H
12
O
6
NaCl
Cl
2
(NH
4)3PO4CuSO4
·5H2
O
18.02 g/mol
180.18 g/mol
58.44 g/mol
70.90 g/mol
149.12 g/mol
249.72 g/molSlide9
Introduction to Molar Conversions
Amount
Mass
1 mol O
2
½ mol O
2
2 mol O
2
3 mol O
2
32.00 g
16.00 g
64.00 g
96.00 gSlide10
Grams to Moles
Converting grams to moles: divide by molar mass.
1. How many moles of Ca are in 5.00g of Ca?
2. How many moles of H
2
O are in 36.0g of H
2
O?
3. How many moles of AgNO
3
are in 124.5g of AgNO
3
?Slide11
Moles to Grams
Converting from moles to grams: multiply by molar mass.
What is the mass in grams of 2.25 moles of Fe?
What is the mass in grams of 0.896 moles of BaCl
2
?Slide12
Types of Particles
Atoms – C, Cu, He
Molecules – O
2, C12H22O11
, CO
2
(all nonmetals in the formula)Formula units – NaCl, CaCl2, Mg(NO3)2 (includes a metal in the formula)Slide13
Particles to Moles
Converting particles to moles: divide by Avogadro's Number.
How many moles of Pb are in 1.50 X 10
25
atoms of Pb?
How many moles of CO
2 are in 6.78 X 1021 molecules of CO2
?
2.49 x 10
1
moles Pb
1.13 x 10
-2
moles CO
2Slide14
Moles to Particles
Converting moles to atoms: multiply by Avogadro's Number.
How many molecules of NO are in 0.87 moles of NO?
How many formula units of NaI are in 2.50 moles of NaI?
5.2 x 10
23
molecules NO
1.51 x 10
24
formula units NaISlide15
Grams to Moles to Particles
Example: How many molecules of N
2
are in 57.1g of N2?Slide16
Particles to Moles to Grams
Example: How many grams of NaF are in 7.89 X 10
24
formula units of NaF?Slide17
Atoms to Moles to Grams
Tough Example:
How many
total atoms are in 235 g of CO2?
9.64 x 10
24
total atomsSlide18
The Mole Bridge