The document discusses the mole, which is defined as 6.022x1023 particles and is used as a unit to describe large numbers of atoms or molecules. It explains that the molar mass of a substance is the mass in grams of one mole of that substance, and provides examples of calculating the number of moles and particles for given masses of various elements and compounds. The document also demonstrates how to use the mole concept to convert between mass and number of particles.

1. Mole and
Number of
Moles of a Given
Compound
MRS. CYRIL A. CONSTANTINO

3. Atom is the basic
unit of an element.
According to John
Dalton, atom was
extremely small and
indivisible.
Can you count the
atoms?

4. Atomic mass unit - unit provides
relative scale for the masses of
elements.
Chemist used a special unit to describe a very large number of atoms.
mole (mol)
1 mole = 6.022 x 1023 particles.
This number is called the Avogadro’s number in honor of Italian scientist
named Amadeo Avogadro.
a pair means 2 (two)
a dozen means 12 (twelve)
a gross means 144 items.

5. Mole
Mole is the amount of a substance that contains
particles. These particles can be an atom, a molecule, an
ion.
One mole is said to be the number of atoms in exactly 12
grams of the isotope 12C
It is also defined as the amount of substance containing
the Avogadro’s number in any kind of chemical unit.

6. Mole
The mass in grams of one mole of substance called
molar mass.
For example,
•1 mole of C12 atom = 12 grams = 6.022 x 1023 atoms.
Element Atomic Weight Molar Mass Avogadro’s Number
Na 23 amu 23 g/mol 6.022 x 1023 atoms
O 16 amu 16 g/mol 6.022 x 1023 atoms

7. Mole
The mass in grams of one mole of substance called
molar mass.
Compound Molecular Mass
/Formula Mass
Molar Mass Avogadro’s Number
CO2 44.0 amu 44.0 g/mol 6.022 x 1023 molecules
Na2S 78.05 amu 78.05 g/mol 6.022 x 1023 formula unit

8. To calculate the number of moles of given
element/compound, the formula is:

9. Sample Problem:
1.Gold (Au) is used in jewelry making. The atomic weight of gold is
197. Find the ff:
◦ a. number of moles
◦ b. number of atoms in 200 grams gold

10. Sample Problem:
2. Suppose you consume 500grams sugar (C12H22O11) in one week.
How many moles of sugar did you consume? Calculate the number
of molecules in 500grams sugar? Molar mass of sugar is 342 grams
per mole.

13. Wellington Flour Mills Company
Founded by Mr. Norberto
Ty and Mrs. Salustiana
Dee Ty since 1954
Flour has chemical
formula of C4H8O4
Molar mass of 120g/mol

16. Convert Mass to the number of Particles

20. Concept
Mapping
1. Analyze the concept map of
each conversion factor
2. Write in the box the
relationship in words
3. Write the relationship in
units.

22. new unit original given
concept map conversion factor

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