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
10 moles of C is how many grams?
10 mol X 12 g = 120 g
1 mole is equal to the mass of what element?
Carbon - 12
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 amu = 2.406 x 1024 amu
What is the molar mass of H2CO3?
Molar mass = 62.03 g/mol
5 mol of He is how many grams?
5 mol x 4 g = 20 g
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
50 g of Ca is how many moles?
Ca = 40 g/mol
50 g / 40 g/mol = 1.25 mol Ca
If you start with grams but need moles what do you do?
Grams divided by (molar mass) grams
How do you go from moles to grams?
Multiply # moles by Molar Mass (g)
Moles to Particles
Multiply by Avogadro's #
What is the molar mass of C6H12O6?
Molar mass = 180.18 g/mol
200 g of NaCl is how many moles?
NaCl= 58 g/mol
200 g / 58 g/mol = 3.45 mol NaCl
If you start with particles and need moles, what do you do?
Particles divided by Avogadro's # to find moles
How to go from grams to moles?
GM -> DM
Grams to Moles, divide by mass (g)
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