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Calculating Molecular Mass / Formula Mass
•
•
For an element one its own, its molecular mass is the atomic mass from the periodic table.
For a molecule of two or more atoms (even things like H 2 and S8), add up the masses of each
atom in the molecule.
Molecular Mass of C2H4O2
•
ChemistNATE
= 2(12.011 g/mol) + 4(1.008 g/mol) + 2(15.999 g/mol)
= 60.052 g/mol
For ionic compounds, the molecular mass is referred to as the formula mass since there are no
distinct “molecules” of the substance – just one big crystal.
1.
Calculate the molecular mass (or formula mass) of each of the following compounds:
a)
NaBr
b)
C17H30
c)
CH3CH2CH3
d)
CF3Cl
e)
(NH4)2HPO4
2.
Buckminsterfullerene is a molecule with a chemical formula of C 60. What is the molecular
mass of this molecule?
3.
The chemical formula of aspartame (an artificial sweetener) is C 14H18N2O5. What is the
molecular mass of this molecule?
Calculating Molecular Mass / Formula Mass
•
•
For an element one its own, its molecular mass is the atomic mass from the periodic table.
For a molecule of two or more atoms (even things like H 2 and S8), add up the masses of each
atom in the molecule.
Molecular Mass of C2H4O2
•
ChemistNATE
= 2(12.011 g/mol) + 4(1.008 g/mol) + 2(15.999 g/mol)
= 60.052 g/mol
For ionic compounds, the molecular mass is referred to as the formula mass since there are no
distinct “molecules” of the substance – just one big crystal.
1.
Calculate the molecular mass (or formula mass) of each of the following compounds:
a)
NaBr
g
Molar Mass=22.99+79.90=102.89 mol
b)
C17H30
g
Molar Mass=17(12.01)+30(1.01)=234.47 mol
c)
CH3CH2CH3
g
Molar Mass=3(12.01)+8(1.01)=44.11 mol
d)
CF3Cl
g
Molar Mass=12.01+3(19.00)+35.45=104.46 mol
e)
(NH4)2HPO4
g
Molar Mass=2(14.01)+9(1.01)+30.97+4(16.00)=132.08 mol
2.
Buckminsterfullerene is a molecule with a chemical formula of C 60. What is the molecular
mass of this molecule?
g
Molar Mass=60(12.01)=720.6 mol
3.
The chemical formula of aspartame (an artificial sweetener) is C 14H18N2O5. What is the
molecular mass of this molecule?
g
Molar Mass=14(12.01)+18(1.01)+2(14.01)+5(16.00)=294.34 mol
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