molar mass. a compound is a collection of bonded together. ethanol, ch 3 ch 2 oh, is made up of :...
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Molar Mass
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Molar Mass A compound is a collection of
bonded together.• Ethanol, CH3CH2OH, is made up of :
carbon atoms, hydrogen atoms, and oxygen atom,
2
6
1
atoms
_________
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Molar Mass of CH3CH2OH How many molecules of ethanol are in one
mole of ethanol?
How many atoms of carbon are in one mole of ethanol?
Of hydrogen?
Of oxygen?
_____________________________
2 x (6.02 x 1023) atoms C !!
6 x (6.02 x 1023) atoms H !!
1 x (6.02 x 1023) atoms O !!
6.02 x 1023 molecules EtOH
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Molar Mass of CH3CH2OH
How many moles of carbon are in one mole of ethanol?
Of hydrogen?
Of oxygen?
_________________________2 moles of carbon!!
___________________________ 6 moles of hydrogen!!
1 mole of oxygen!!________________________
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Molar Mass In general, in a chemical formula, the
number of atoms of an element in a molecule of a compound is the same as the number of moles of that element in a mole of the compound.
C6H12O6 Fe2O3
Now let’s relate mass to moles in a chemical formula.
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Molar Mass of CH3CH2OH
How many grams in 1 mole of carbon?
12.01g In 1 mole of hydrogen?
1.008g In 1 mole of oxygen?
16.00g
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Molar Mass of CH3CH2OH Now let’s calculate the molar mass of
ethanol: 2 moles C 12.01g C = 24.02 g
1 mole C
6 moles H 1.008g H = 6.05 g 1 mole H
1 moles O 16.00g O = 16.00 g 1 mole O 46.07g
Molar Mass of EtOH = 46.07g/mole
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Molar Mass
“The Molar mass of a compound is
the sum of the atomic masses for
each element in the compound,
multiplied by the number of times the
element occurs in the compound”.
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Molar Mass - Practice Calculate the molar mass of:
NaCl =
Al2O3 =
C6 H12O6 =
Na3PO4 =
23.01g Na/mol + 35.45g Cl/mol = 58.45 g/mole
2(26.98gAl/mol) + 3(16.00gO/mol) = 101.96 g/mole
6(12.01gC/mol) + 12(1.008gH/mol) + 6(16.00gO/mol) = 180.16 g/mole
3(23.01gC/mol) + (30.97gP/mol) + 4(16.00gO/mol) = 117.98 g/mole