Moles
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Transcript of Moles
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.