Moles
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 = 0.5000 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
1 mole of lead (Pb) has this mass and number of atoms
207.2 g and 6.02x1023 atoms
How many grams is 1.2 moles of H2O?
22g H2O
How many molecules are in 3.996 mol of C6H12O6?
3.996 mol X 6.02 x 1023 amu = 2.406 x 1024 amu
What is the molar mass of H2CO3?
Molar mass = 62.03 g/mol
20 g CaCl2 to formula units
1 x 1023 formula units CaCl2
If you start with Liters but need moles what do you do?
Divide by 22.7
How many moles are in 85 g of AgNO3?
BONUS (Extra Point): Name of the Compound
Molar mass = 169.88 g/mol
85g / 169.88 g/mol = 0.50 mol AgNO3
SILVER NITRATE
How many molecules are in 133.45 mol of sulfur dioxide?
133.45 mol x 6.02 x 1023 = 8.0337 x 1025 molecules SO2
What is the molar mass of Lithium Bromide?
Molar mass = 86.84 g/mol
3.25 x 1024 atoms Na to Liters
123 L 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?
0.440 mol or 4.40 x 10-1 Na2SO4
How many moles of CO2 are there if you have 6.87 x 1026 atoms of oxygen?
571 mol CO2
What is the molar mass of C6H12O6?
Molar mass = 180.18 g/mol
2.06 x 1024 formula units of NaCl to grams
200. or 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 are in 3.5 mol of Calcium Phosphate?
Molar mass Ca3(PO4)2 = 310.18 g/mol
3.5 mol X 310.18 g/mol = 1085.63 g
FINAL= 1100 or 1.1 x103 g
How many atoms of oxygen are in 53.45 mol of SO4?
1.287 x 1026 atoms Oxygen
What is the molar mass of Pb(C2H3O2)4?
BONUS POINT: What is the name of the compound?
443.4 g/mol
Lead (IV) Acetate
10.0 g of Cu(NO3)2 is how many atoms of Nitrogen?
BONUS POINT: What is the name of the compound?
Molar Mass Cu(NO3)2 = 187.57 g/mol
(10 g / 187.57 g/mol )x 6.02x 1023 x 2 atoms N =
FINAL: 6.42 x 1022 atoms N
COPPER (II) NITRATE