7.1
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7.1 Molar Mass of an Element and Compound
MOLAR MASS OF AN ELEMENT
What is the Mass of the following? (Use your Periodic Table)
1 mole of C
2 moles of C
1 mole of Silver
2 moles of Silver
1 mole of Gold
12 grams
2ร12 g/mole =
24 grams
107.87 grams
2ร108 g/mole โ
216 grams
196.97 grams
1 mole of Sodium
2 moles of Sodium
1 mole of Iron
2 moles of Iron
3 moles of Iron
23.00 grams
2ร23 g/mole โ
46 grams
55.85 grams
2ร56 g/mole โ
112 grams
3ร56 g/mole โ
168 grams
CALCULATING MOLAR MASS FOR A MOLECULE/COMPOUND
The molar mass of a molecule is the molar mass of all of the parts of the molecule added together. For
example, the molar mass for a water molecule H2O is the molar mass of 2 Hydrogen and 1 Oxygen.
Mathematically this would be done in the following method:
1 molecule of water is H2O. It has 2 hydrogen atoms and a single oxygen.
H2O
Calculate the molar mass for the following compounds
H2SO4
Element
# in one
Molecule
Molar Mass of
Element
Subtotal
H
2
1.00 gram/mole
2.00 gram/mole
O
1
16.00 gram/mole
16.00 gram/mole
18.00 gram/mole
Element
# in one
Molecule
Molar Mass of
Element
Subtotal
H
2
1.01 gram/mole
2.02 gram/mole
S
1
32.07 gram/mole
32.07 gram/mole
O
4
64.00 gram/mole
64.00 gram/mole
98.09 gram/mole
