Moles

MOLESThe basic quantity in ChemistryWhat is a mole?A furry blind animal?

A beauty spot?

Lady Gaga?

A mole in Chemistry...Its like a dozen...a set numberSI unit for the amount of a substanceAbbreviation: molSymbol: n

For example, if I have 5 moles ofCopper, I could write:

nCu = 5 mol

How many eggs in a dozen?12

How many eggs in 5 dozen?

Number of eggsNumber of dozensNumber of eggs in a dozen=X=5 X12= 60 eggs

How much is a mole?The number of particles in a mole is:6.02 x 1023

(602,000,000,000,000,000,000,000 particles)

Symbol: NA

Avogadros Number

Representative particles: type of particlein which a substance normally exists.For example: hydrogen, water, iron

Amedeo AvogadroHow many particles in a mole?6.02 x 1023

How many particles in 5 moles?

Number of particlesNumber of molesNumber of particles in a mole=X=5 X 6.02 x 1023= 3.01 x 1024 particlesHow much is a mole?

How much is a mole?

Copper Sulphate pentahydrate249.7 gZinc65.4 gSulphur32.1 gMercury (II) oxide32.1 gSodium Chloride58.5 g12.0 gCarbon63.6 gCopperEthanol46.0 gMolar MassMass (in g) of 1 mol of substance.Equal to relative atomic mass.E.g. Copper: 63.5 g/mol (or g mol-1)

CalculatingLEARN IT!!!ExampleHow many moles are in 60.2 g of iron?M(Fe) = 55.8 g/mol

What do I know?m = 60.2g, M(Fe) = 55.8 g/molWhat do I need to know?number of moles (n)How do I get there?n = m/M

ExampleHow many moles are in 124.5g of calcium carbonate?

What do I know?m = 124.5g, Calcium carbonate is CaCO3What do I need to know?number of moles (n), M(CaCO3)How do I get there?n = m/MM(CaCO3) = M(Ca) + M(C) + 3M(O)

Your turn!How many atoms are there in a pure copper coin weighing 2.56 g? The atomic weight of copper is 63.6.