Oh My!!. Mole (mol) can be defined as the number equal to the number of carbon atoms in 12.01 grams...
15
MOLES, AVOGADRO’S NUMBER, AND MOLAR MASS Oh My!!
-
Upload
cuthbert-poole -
Category
Documents
-
view
212 -
download
0
Transcript of Oh My!!. Mole (mol) can be defined as the number equal to the number of carbon atoms in 12.01 grams...
MOLES, AVOGADRO’S
NUMBER, AND MOLAR MASS
Oh My!!
DEFINITIONS Mole (mol) can be defined as the number equal
to the number of carbon atoms in 12.01 grams of carbon (in an chemical equation it is the coefficients that tell how many moles of each compound there are)
Avogadro’s number- one mole of something (anything) consists of 6.022 x 1023 units (atoms, molecules, particles, etc…) of that substance
1 mol = 6.022 x 1023 units
Molar mass- is obtained by summing the masses of the component atoms
EXAMPLES 1 mol of Ag= 107.9 amu or g/mol 1 mol of Ag= 6.022 x1023 atoms
1 mol of Pb= 207.2 amu or g/mol 1 mol of Pb= 6.022 x 1023 atoms
Molar mass of CH4 = 16 g (1 C and 4 H) Molar mass of CaCO3 = 100 g (1 Ca, 1 C
and 3 O) Molar mass of C10H6O3 = 174.1 g (10 C, 6
H, and 3 O)
PRACTICE Chemical equation
Mg + 2HCl MgCl2 + H2
Moles
Molar mass of 1 mol of the compound
Avogadro’s #
PRACTICE Chemical equation
Mg + 2HCl MgCl2 + H2
Moles 1 mol 2 mols 1 mol 1 mol
Molar mass of 1 mol of the compound
Avogadro’s #
PRACTICE Chemical equation
Mg + 2HCl MgCl2 + H2
Moles 1 mol 2 mols 1 mol 1 mol
Molar mass of 1 mol of the compound
24.31 amu or g/mol
36.45 amu or g/mol
95.21 amu or g/mol
2 amu or g/mol
Avogadro’s #
PRACTICE Chemical equation
Mg + 2HCl MgCl2 + H2
Moles 1 mol 2 mols 1 mol 1 mol
Molar mass of 1 mol of the compound
24.31 amu or g/mol
36.45 amu or g/mol
95.21 amu or g/mol
2 amu or g/mol
Avogadro’s #
6.022 x 1023 atoms
1.20 x 1024 molecules
6.022 x 1023
molecules
6.022 x 1023
molecules
MORE PRACTICE Chemical Equation
C2H5OH + 3O2 2CO2 + 3H20
Moles
Molar Mass of 1 mol of the compound
Avogadro’s #
MORE PRACTICE Chemical Equation
C2H5OH + 3O2 2CO2 + 3H20
Moles 1 mol 3 mols 2 mols 3 mols
Molar Mass of 1 mol of the compound
Avogadro’s #
MORE PRACTICE Chemical Equation
C2H5OH + 3O2 2CO2 + 3H20
Moles 1 mol 3 mols 2 mols 3 mols
Molar Mass of 1 mol of the compound
46 amu or g/mol
32 amu or g/mol
44 amu or g/mol
18 amu or g/mol
Avogadro’s #
MORE PRACTICE Chemical Equation
C2H5OH + 3O2 2CO2 + 3H20
Moles 1 mol 3 mols 2 mols 3 mols
Molar Mass of 1 mol of the compound
46 amu or g/mol
32 amu or g/mol
44 amu or g/mol
18 amu or g/mol
Avogadro’s #
6.022 x 1023 molecules
1.80 x 1024
molecules1.20 x 1024 molecules
1.80 x 1024 molecules
EVEN MORE PRACTICE Chemical Equation
Zn + 2 AgCl
2 Ag + ZnCl2
Moles
Molar mass of 1 mol of the compound
Avogadro’s constant
EVEN MORE PRACTICE Chemical Equation
Zn + 2 AgCl
2 Ag + ZnCl2
Moles 1 mol 2 mols 2 mols 1 mol
Molar mass of 1 mol of the compound
Avogadro’s constant
EVEN MORE PRACTICE Chemical Equation
Zn + 2 AgCl
2 Ag + ZnCl2
Moles 1 mol 2 mols 2 mols 1 mol
Molar mass of 1 mol of the compound
65.38 amu or g/mol
143.3 amu or g/mol
107.9 amu or g/mol
136.28 amu or g/mol
Avogadro’s constant
EVEN MORE PRACTICE Chemical Equation
Zn + 2 AgCl
2 Ag + ZnCl2
Moles 1 mol 2 mols 2 mols 1 mol
Molar mass of 1 mol of the compound
65.38 amu or g/mol
143.3 amu or g/mol
107.9 amu or g/mol
136.28 amu or g/mol
Avogadro’s constant
6.022 x 1023 atoms
1.20 x 1024
molecules1.20 x 1024 atoms
6.022 x 1023 molecules
