1. The Mole and Molar Mass

2. Atomic Structure Review
Average Mass Atomic Mass
Weighted average of all known isotopes of an element
Stated in g/mol in periodic table
Molecular /Formula Mass
The sum of the atomic masses of all the elements in a compound
Added all g/mol for all components of the formula so answer is g/mol

3. Calculating the Formula Mass
3 Steps to calculate the formula mass/molecular mass
Above all Double Check to make sure you have the correct formula
Count the atoms of each element
Multiply the number of atoms by the elements atomic mass (round mass to hundredths)
Add all the masses together

4. B. Molar Mass Examples carbon aluminum zinc 12.01 g/mol 26.98 g/mol

5. B. Molar Mass Examples water sodium chloride H2O
2(1.01) = g/mol
NaCl
= g/mol

6. B. Molar Mass Examples sodium bicarbonate sucrose NaHCO3
(16.00) = g/mol
C12H22O11
12(12.01) + 22(1.01) + 11(16.00) = g/mol

7. The Mole, Chemistry's Mascot

8. Units of Measurement Fundamental Units Dozen = 12 things
Bakers dozen= 13 things
Pair= 2 things
Decade = 10 years
Gross = 144 things
Ream = 100 things
I Mole = 6.02 x 1023 things (Avogadro’s number)= 602 sextillion things (atoms, molecules, ions, pennies…)

9. Measuring with Moles The Mole is a counting unit
Called the chemist’s dozen
Used to count number of
Atoms, Molecules (nm + nm)(m + nm)...
We can count both atoms, molecules or ions
We can count in groups (n, moles) or individual particles (N) using the defined grouping definition of Avogadro’s number (NA)
n= N/NA (the NAN equation)

10. Conversions with Moles
How do you find mass of one mole of substance?
We can do this if we know the formula
When we do this we get the MOLAR MASS, mm or M
The mass in grams of 1 mole of substance is equal to the formula mass
Units: grams/mol
n=m/mm (the M&n equation)

11. Conversions with Moles
Mass
= number of moles
Molar mass

12. Super Mole Highway So Far we Can Convert Between
Grams (mass,m)
Moles (amount in mols, n)
Using molar mass (mm)
Particles (ungrouped number of things, Na
Using Avogador’s #, (N)
The Mole Highway will help us

13. Super Mole Highway molar mass (g/mol) 6.02  1023 (mm) (particles/mol)÷ x
6.02  1023
(particles/mol)
(Na) X ÷
MASS IN
GRAMS
MOLES
NUMBER OF
PARTICLES