The Basic Chemical Unit The Mole The Basic Chemical Unit

A Mole is : A chemical quantity A Mole of any substance is Chemically equivalent to a mole of any other substance

particles as the number of atoms in exactly 12.0 grams of Carbon-12. A Mole is : Anything that has the same number of particles as the number of atoms in exactly 12.0 grams of Carbon-12.

Avogadro’s Number 6.02 x 1023

Representative Particles HOW TO COUNT

Elements Atoms

Covalent Compounds Molecules

Ionic Compounds Formula Units

One Mole of : Carbon = 6.02 x 1023 Carbon Atoms Silicon = 6.02 x 1023 Silicon atoms

One Mole of : CO2 = 6.02 x 1023 Carbon DiOxide Molecules HNO3 = 6.02 x 1023 Nitric Acid Molecules

One Mole of : Platinum = _______ Platinum Atoms Scandium = ______ Scandium atoms

One Mole of : CaCO3 = _______ Calcium Carbonate molecules C12H22O11 = ______ Sugar molecules

Molar Mass

Defination The mass of one mole of a substance.

One Mole of : Carbon = 12.0 g Silicon = 28.1 g Barium = 137.3 g Helium = 4.0 g

One Mole of : Element = (molar mass) g Compound = (mol mass) g Substance = (mol mass) g

One Mole of : Aluminum = ____ g Arsenic = ____ g Silver = _____ g Xenon = _____ g

One Mole of : CO2 = 44.0 g SO3 = 80.1 g BaSO4 = 233.4 g (NH4)3PO4 = 149.0 g

One Mole of : CaCl2 = ____ g CoCO3 = ____ g Pb(NO3)2 = _____ g Al2(CO3)3 = _____ g

One Mole of : CaCl2 = 111.1 g CoCO3 = 118.9 g Pb(NO3)2 = 331.2 g Al2(CO3)3 = 234.0 g

Molar Volume

Molar Volume The volume of one mole of gas @STP.

STP Standard Temperature and Pressure

1 mole of gas @ STP 22.4 liters

Does not matter what the gas is.

Converting between Moles and Grams: 1 mol = (molar mass) g Conversion factors: __ mol x ___ g x

Converting between Moles and Grams: 2.8 mol Ag = ? g Ag 2.8 mol x 57.9 g Mg = ? mol Mg 57.9 g x

Converting between Moles and Atoms: 2.8 mol Ag = ? atoms of Ag 2.8 mol x 57.9 g Mg = ? atoms Mg 57.9 g x

Convert 14.9 g H2O into moles 14.9 g x 1 mol 18.02 g H2O = 0.828 mol

Convert 3.4 mol H2O into grams 3.4 mol x 18.02 g H2O 1 mol = 61.2 grams

Convert 25.1 g of CO2 into moles: 25.1 g x 1 mol CO2 44.01 g CO2 = 0.570 mol

Convert 35.8 g H2O into molecules: 35.8 g x 6.02x1023molecules 18.02 g H2O = 1.20x1024molecules

Convert 0.191 moles of Cl2 into molecules: 0.191 mol x 6.02x1023molecules 1 mol = 1.15x1023molecules

Convert 2.88x1024 molec- ules of Cl2 into moles: 2.88x1024 molecules x 1 mol 6.02x1023molecules = 4.78 moles

What is the mass of 15 atoms of gold? 1 mole 15 atoms x 6.02x1023 atoms 196.97 g X 1 mole

What is the mass of 15 atoms of gold? = 4.91 x 10-21 g