A DOZEN roses = 12 roses

A PAIR of shoes = 2 shoes

a DOZEN eggs = 12 eggs

a REAM of paper = 500 sheets

A GROSS of pencils = 144 pencils

A SIX –PACK of beer = 6 cans

TRIO

QUARTET

When you have a dozen of something, no matter what you are talking about, you

have 12 of that thing.

-A dozen donuts- a dozen eggs

-a dozen cars, -a dozen chemistry problems are all 12 of that material.

The mole is the exact same concept. You can have:- a mole of eggs- a mole of donuts- a mole of cars- a mole of chemistry problems.

However a mole is MUCH bigger than 12 ...it is 602 sextillion. Obviously a mole of chemistry problems is

way too many problems.

The mole is typically used for counting or grouping very very small things,

like

atoms

a MOLE (mol)1. The mole is an SI unit that allows us

to count # of:- Atoms - molecules- formula units without actually seeing them

Representative

particles

2. 1 mol = 6.02 x 1023

representative particles

3. The number is called “Avogadro’s number” in honor of the Italian scientist Amadeo Avogadro

Avogadro’s number

Atoms or

Molecules or

FUNs

1 mole of anything = 6.02 x 1023

MOLE DAY

4. REPRESENTETIVE particles:

1. ATOMs (elements on the PT)

2. MOLECULES (_______compounds – all elements are non metals) EX: CO2, NO2, C12H22O11

3. Formula Units (_____compounds – at least one element must be a metal)

EX: NaCl, CuCl2, FeO

covalent

ionic

A DOZEN

MASS of a dozen limes = MASS of a dozen cars

A MOLE

CARBON COPPER

MASS of a mole carbon = MASS of a mole copper

6.02 x 1023 C atoms = 6.02 x1023 Cu atoms

HOW DO YOU DETERMINE

THE MASS OF A MOLE ?

MOLAR MASS – the mass of 1 mole of any pure substance (element and compound)

Molar Mass (MM) = Atomic mass (AM)

MM units - g/molAM - Atomic Mass units - amu (atomic mass units)

EX: Mn - 54.94 amu = 54.94 g/mol

EXAMPLES:1. 1 mole of Al :

2. 1 mole of CO2:

AM (C) = 12.011 amu = MM

# of atoms = # of moles

AM (O) = 16.00 amu x 2 = MM

12.011 + 2 (16.00) = 44.01 g/mole

AM 26.98 g = MM 26.98 g/mol

3. 1 mole of Cu(NO2)2:

AM (Cu) 63.546 amu = MM g/mole

AM (N) 14 x 2 amu = MM g/mole

AM (O) 16 x 4 amu = MM g/mole

63.546 + 2(14) + 4 (16) = 155.5 g/mole