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Plotting Experimental Data
General Chemistry I and II Lab Manual
Dakota State University
page 215 of 232
experimental data has molecular weights ranging from 86 g/mol to 142 g/mol.
Then I
will make a plot that runs from at most 16 g/mol through at least 142 g/mol.
For ease of
calculation, I may choose numbers close to our limits, such as, say, 10 g/mol to 150
g/mol as my limits.
Doing this tends to make it easier to figure out the scale.
As for the y axis, it is a little more difficult.
We want to choose a minimum value
that we expect will be low enough include the boiling point of a chemical with molecular
weight of 10 g/mol. It would be much easier if we knew we wanted the graph to go to
some finite amount.
Looking at the experimental data, it looks to me as if the boiling
point for 10 g/mol should not be less than, say, 50
o
C, so this is the value I will choose for
the minimum value for the boiling point.
If it turns out that this guess is far too small or
far too large, I’ll choose a new minimum value and replot.
Choosing a Graph Orientation:
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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, Mole

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