1. The Heart of Chemistry

2. At STP, 1 mol of any gas occupies 22.4 L
What is STP?
Standard Temperature and Pressure

3. What is standard temperature & pressure?
Standard temperature is 0o C
Standard pressure is kPa or 1 atm

4. Why is the volume of a gas measured at STP?
The volume of gas varies with a change in temperature and pressure
At the same temperature & pressure:
1 mole of any gas has
the same volume.

5. 1 mol = 6.02 x 1023 atoms, molecules or ions
1 mol = 22.4 L
1 mol = 6.02 x 1023 atoms, molecules or ions
1 mol = molar mass in g

6. The Mole Mall Conversions
Volume of Gas
(at STP)
_1 mol_
22.4 L
_22.4 L_
1 mol
_Molar mass_
1 mol
______1 mol______
6.02 x 1023 particles
Mass
Mole
Representative
Particles
molecules
formula units
atoms
___1 mol___
Molar mass
_6.02 x 1023 particles
1 mol
_____# of atoms____
1 molec (or form unit)
_1 molec (or form unit)_
# of atoms
The Mole Mall Conversions
Number of Atoms in formula

7. The Mole Mall Conversions
Volume of Gas
(at STP)
_1 mol_
22.4 L
_22.4 L_
1 mol
______1 mol______
6.02 x 1023 particles
Representative Particles
(molecules / formula units / atoms)
_Molar mass_
1 mol
Mole
Mass
___1 mol___
Molar mass
_6.02 x 1023_ particles
1 mol
_____# of atoms____
1 molec (or form unit)
_1 molec (or form unit)_
# of atoms
Number of Atoms in formula
The Mole Mall Conversions

8. The Mole Mall: Let’s go shopping!
Volume
1 mol B = 22.4 L B
The Mole Mall: Let’s go shopping!
Get x & y from the coefficients in the balanced equation
Volume
1 mol A = 22.4 L A
Mol B
1 mol A x mol B = __ mol B
y mol A
Molecules
1 mol B = 6.02 x 1023 molecules B
Mol A
Mass
1 mol B = (molar mass) g B
Molecules
1 mol A = 6.02 x 1023 molecules A
Mass
1 mol A = (molar mass) g A

9. Molecules, Form. Units, Atoms
The Heart of Chemistry
Atoms in
Formula
÷ no. of atoms
in formula
÷ 22.4 L
X no. of atoms
in formula
Volume
X 22.4 L
Molecules, Form. Units, Atoms
÷ 6.02 x 1023
X 6.02 x 1023
Mole
÷ molar mass (g)
X molar mass (g)
Mass (g)

10. ÷ 22.4 L ÷ 6.02 x 1023 ÷ molar mass (g) The Heart of Chemistry
Molecules, Form. Units, Atoms
Volume
÷ 22.4 L
÷ 6.02 x 1023
X 22.4 L
x 6.02 x 1023
Mole
÷ molar mass (g)
X molar mass (g)
Mass (g)