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Factor Label Method
General Chemistry I and II Lab Manual
Dakota State University
page 224 of 232
CONVERSION FACTORS:
no additional conversion factors needed
Notice that we have not one, but
two
single unit numbers (150,000 cal and 100. g).
With
which do we start?
Well, without any further information, it's not clear, so we'll start
with one of them, say 100 g, and we'll just keep going.
So, let's set it up.
100
10
1
150 000
6 67 10
4
1
.
*
.
*
,
.
g
cal
g C
cal
x
C
o
o
=


There are a couple of things to note about this problem.
The first is that the last term is
written as 1/150,000 cal.
I knew I needed calories in the denominator to cancel calories
in the numerator, but 150,000 calories is a single unit number.
Thus, I recognize that
150,000 cal is equivalent to 150,000 cal / 1, so to get calories in the numerator, I just
"flip" this number around.
I did NOT add any superfluous or artificial units to the "1" in
the numerator.
When we write 150,000 cal in this fashion, this means that we
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.
 Fall '11
 JosephWalter
 Chemistry

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