1) 0.00045

2) 3.4 x 10-5

3) 0.001

4) 5.6 x 103

Remembering Scientific Notation…..

The Mole

Main unit in chemistry we will use ! ! !

Describes the amount of atoms in a particular substance

1 mole = 6.02 x 1023 atoms (KNOW THIS CONVERSION)

1 mole = formula mass (g) of a compound

= atomic mass (g) of an element

= 22.4 L of a solution under STP

The MOLE

Example 1: Carbon

Example 2: Aluminum

= mass of 1 mole of a substance

Units = grams/mole or g/mol

Molar Mass

1 mole = 6.02 x 1023 atoms

“Avogadro’s number”

How many atoms are in 1 mole?

How many atoms are in 1 mole of Mg?

Example 1

How many atoms are in 1 mole of C?

Example 2:

MOLE CONVERSIONS

Remember…..

1 mole = 6.02 x 1023 atoms of

element/molecules of chemical compound

Atomic mass of element Formula mass of a compound

Example 1:

2 moles Carbon grams

Example 2:

Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?

Example 3:

86.2 grams C2H4. How many moles of C2H4? How many molecules?

Example 4:

1.26 moles of NbI5. How many grams?

Example 5:

5 grams of H2O to molecules of H2O

Practice

Mole Conversion Worksheet