Moles and Molar Mass Notes
Moles and Molar Mass Notes
The Mole (mol) is a way of counting particles of matter.
1 mol of any substance is equal to 6.02 x 1023 particles (atoms or molecules)
Like: 1 dozen = 12 things
1 ream = 500 things
1 mol = 6.02 x 1023 things
Atomic Mass (AM)- the mass of 1 mole of any element expressed in grams
1 mol H = 1.0g = 6.02 x 1023 atoms 1 mol C = 12.0 g = 6.02 x 1023 atoms 1 mol O = 16.0 g = 6.02 x 1023 atoms
Look up value from Periodic Table
Gram Molecular Mass (GMM)- Mass in grams of a mole of a molecular compound
Gram Formula Mass (GFM) ? Mass in grams of a mol of an ionic compound
Molar Mass ? General term for GMM or GFM.
How to calculate Molar Mass
1. Must have correct formula
2. Find the Atomic Mass for each element (look on Periodic Table)
3. Add the totals together
4. Round to the 0.1 place
Example 1
Example 2
SO3
S 1 atom x 32.1 = 32.1 g
Ba(NO3)2
Ba 1 atom x 137.3 = 137.3g
O 3 atoms x 16.0 = 48.0 g
N 2 atoms x 14.0 = 28.0g
80.1 g/mol
0 6 atoms x 16.0 = 96.0g
261.3g/mol
1 mol SO3 = 80.1 g or 6.02 x 1023 molecules of SO3 = 80.1 g
1 mol Ba(NO3)2 = 261.3 g or 6.02 x 1023 molecules of Ba(NO3)2 = 261.3 g
Mole Road Map
Volume of gas in Liters
1 mole 22.4 L
22. 4 L 1 mole
molar mass 1 mole
Mass in grams
Moles
1 mole molar mass
6.02 x 1023 1 mole
1 mole 6.02 x 1023
# of particles atoms/molecule
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