A dozen roses 12 roses
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A DOZEN roses = 12 roses PowerPoint PPT Presentation


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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.

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A DOZEN roses = 12 roses

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A dozen roses 12 roses

A DOZEN roses = 12 roses


A pair of shoes 2 shoes

A PAIR of shoes = 2 shoes


A dozen eggs 12 eggs

a DOZEN eggs = 12 eggs


A ream of paper 500 sheets

a REAM of paper = 500 sheets


A gross of pencils 144 pencils

A GROSS of pencils = 144 pencils


A six pack of beer 6 cans

A SIX –PACK of beer = 6 cans


A dozen roses 12 roses

TRIO


Quartet

QUARTET


When you have a dozen of something no matter what you are talking about you have 12 of that thing

When you have a dozen of something, no matter what you are talking about, you have12 of that thing.

  • A dozen donuts- a dozen eggs

  • a dozen cars,

  • a dozen chemistry problems are all 12 of that material.


A dozen roses 12 roses

  • 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.


A dozen roses 12 roses

The mole is typically used for counting or grouping

very very small things, like

atoms


A mole mol

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 10 23 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

Avogadro’s number

1 mole of anything=6.02 x 1023

Atoms or

Molecules or

FUNs


Mole day

MOLE DAY


4 representetive particles

4. REPRESENTETIVE particles:

  • ATOMs (elements on the PT)

2. MOLECULES (_______compounds –

all elements are non metals)

EX: CO2, NO2, C12H22O11

covalent

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

EX: NaCl, CuCl2, FeO

ionic


A dozen

A DOZEN

MASS of a dozen limes = MASS of a dozen cars


A mole

A MOLE

CARBON

COPPER

MASS of a mole carbon = MASS of a mole copper

6.02 x 1023 Catoms = 6.02 x1023 Cu atoms


How do you determine the mass of a mole

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

Molar Mass (MM) = Atomic mass (AM)

  • MM units - g/mol

  • AM - Atomic Mass units - amu (atomic mass units)

EX: Mn - 54.94 amu = 54.94 g/mol


Examples

EXAMPLES:

  • 1 mole of Al :

AM 26.98 g =

MM 26.98 g/mol

# of atoms = # of moles

2. 1 mole of CO2:

AM (C) = 12.011 amu = MM

AM (O) = 16.00 amu x 2 = MM

12.011 + 2 (16.00) = 44.01 g/mole


3 1 mole of cu no 2 2

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


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