1. The MOLE CH 11

2. Mole (mol) SI base unit used to measure the amount of a substance
One (1) mole of anything is 6.02 X 1023
Compare to other counting units:
Pair = 2
Dozen = 12
Gross = 144
Ream = 500
Mole = 6.02 X 1023

3. Math Practice How many gloves are there in 8 prs?
How many roses in 2.5 doz?
How many atoms in 0.5 mol?

4. Avogadro’s Number is 6.02 X 1023
Amedeo Avogadro determined the volume of one mol of gas

5. Molar Mass The mass in grams of one mole of any pure substance
Numerically equal to its atomic mass (amu) but, has the units g/mol
Example:
An atom of manganese has a mass of amu
A molar mass = 1 mol of manganese
54.94 g of Mn contains 6.02 X 1023 atoms of Mn

6. Molar Mass Ionic Compounds Use the formula mass Example:
Sodium Chloride
A mole of sodium has mass = g
A mole of chloride ions has mass = g
One mole of NaCl = g
Or, the molar mass of NaCl is g/mol

7. What is the molar mass of potassium nitrate?

8. Molar Mass Of a metal Use the atomic mass converted to g/mol Example:
Iron
A mole of iron has mass = g
One mole of Fe = g
Or, the molar mass of iron is g/mol

9. Practice
What mass of aluminum foil will contain an Avogadro’s number of Al atoms?
An experiment calls for mol of Al. How much should be weighed out?

10. Molar Mass of Nonmetallic Elements
Use the mass of 6.02 X 1023 molecules
What is the molar mass of:
A. hydrogen
B. nitrogen
C. oxygen

11. Molar Mass of Molecules
What is the molar mass of water?
A mol of water molecules contains
_____ mol of H atoms
_____ mol of O atoms
The molar mass of water is ______________

12. Calculations with Moles
a. Counting mol if given the mass
Ex. How many moles of calcium are there in a 16.0 g sample?
Track Method: =

13. Calculations with Moles
a. Counting mol if given the mass
Ex. How many moles of calcium are there in a 16.0 g sample?
Track Method:
16.0 g Ca
= mol

14. Calculations with Moles
a. Counting mol if given the mass
Ex. How many moles of calcium are there in a 16.0 g sample?
Track Method:
16.0 g Ca mol Ca
40.1 g Ca
= mol

15. Calculations with Moles
a. Counting mol if given the mass
Ex. How many moles of calcium are there in a 16.0 g sample?
Track Method:
16.0 g Ca mol Ca
40.1 g Ca
= mol

16. Calculations with Moles
b. Relating mass to number of particles
Ex. What is the mass of 2.50 X 1021 calcium atoms?
Track Method:
2.50 X 1021 atoms
= g Ca

17. Calculations with Moles
b. Relating mass to number of particles
Ex. What is the mass of 2.50 X 1021 calcium atoms?
Track Method:
2.50 X 1021 atoms g Ca
6.02 X 1023 atoms
= g Ca

18. Calculations with Moles
b. Relating mass to number of particles
Ex. What is the mass of 2.50 X 1021 calcium atoms?
Track Method:
2.50 X 1021 atoms g Ca
6.02 X 1023 atoms
= g Ca