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I.
The Meaning of Balanced Equation
1.
Balancing an equation
ex) Combustion Reaction (p. 197)
C
3
H
8
(g) + 5O
2
(g)
3CO
2
(g) + 4H
2
O(g)
the number of molecules of each element need to be equal,
both on the left and the right side of a ‘balanced’ equation.
In our equation above, we have 3 C’s, 8 H’s, and 10 O’s on
both side of the equation.
2.
What we can’t have
Decimals as coefficients
Molecules that come out of nowhere
Unbalanced equations
II.
Mole – Mole Conversion
1.
Mole Ratio
When an equation is balanced, it becomes easy for us
to ‘read’ the mole ratio.
C
3
H
8
(g) + 5O
2
(g)
3CO
2
(g) + 4H
2
O(g)
In the above ‘balanced’ equation, we can say the ratio
between the C
3
H
8
and O
2
is 1:5 ratio.
Since we are dealing with moles of a molecule, not its
mass, we can simply compare the ratio by simply using
the number in front of the balanced equations.
•
This does NOT work with an Unbalanced
equation. You MUST have a balanced equation
for this to work!!!
2.
Mole – Mole Conversions
Example 6.1 (pg. 199)
If 1.14mol of CO
2
was formed by the combustion of
C
3
H
8
, how many moles of H
2
O were also formed?
C
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 Spring '08
 staff

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