Post on 24-Dec-2015
transcript
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