Mole Concepts
Avogadro's Number
6.02 x 1023
How many moles are in 79.85 g of Fe2O3?
Molar mass Fe2O3 = 159.7 g/mol
79.85 g / 159.7 g/mol = 0.5 mol
How many moles are in 3.01 × 1024 molecules of (NH4)2SO4?
3.01 × 1024 amu / 6.02 x 1023 amu = 5 mol
What is the molar mass of HCl?
Molar mass HCl = 36.46 g/mol
120g of C to atoms C
6.0 x 1024 atoms C
207.2 g and 6.02x1023 atoms
How many grams are in 3.5 mol of Ca3(PO4)2?
Molar mass Ca3(PO4)2 = 310.18 g/mol
3.5 mol X 310.18 g/mol = 1085.63 g
How many molecules are in 3.996 mol of C6H12O6?
3.996 mol X 6.02 x 1023 = 2.406 x 1024
What is the molar mass of H2CO3?
Molar mass = 62.03 g/mol
20g CaCl2 to formula units
1.1 x 1023 formula units CaCl2
Who came up with the concept of the mole?
Amadeo Avogadro
How many moles are in 85 g of AgNO3?
BONUS: Name of the Compound
+2 on Test
Molar mass = 169.88 g/mol
85g / 169.88 g/mol = 0.5 mol AgNO3
SILVER NITRATE
How many molecules are in 133.45 mol of SO2?
133.45 mol x 6.02 x 1023 = 8.03 x 1025 molecules
What is the molar mass of LiBr?
Molar mass = 86.84 g/mol
3.25 x 1024 atoms Na to grams
124g Na
If you start with grams but need moles what do you do?
Grams divided by (molar mass) grams
How many moles are in 62.5 g of sodium sulfate?
.440 mol Na2SO4
Moles to Particles
Multiply by Avogadro's #
What is the molar mass of C6H12O6?
Molar mass = 180.18 g/mol
2.06 x 1024 formula units of NaCl to grams
2.00 x 102 g NaCl
If you start with particles and need moles, what do you do?
Particles divided by Avogadro's # to find moles
How many grams is 1.2 moles of H2O?
22g H2O
Particles to Moles
Divide by Avogadro's #
What is the molar mass of Ca(OH)2?
BONUS: What is the name of the compound?
+2 on Test
74 g/mol
CALCIUM HYDROXIDE
10 moles of Cu(NO3)2 is how many grams?
BONUS: What is the name of the compound?
+2 on Test
Molar Mass Cu(NO3)2 = 187.56 g/mol
187.56 g/mol x 10 mol = 1875.60 grams
COPPER NITRATE