Teacher’s Notes—Ideal Gas Law Electronic Workbook
TD-8596A
9
012-08420B
Answers to Questions in the Electronic Workbook:
1.
The slope of each line is nR. From the slope and the initial pressure and temperature on Table 1, the initial volume of
gas is:
I
nitial Volume = nRT⁄P = (21.3 cc·kPa⁄K) × (300 K) ⁄ (102 kPa) = 62.8 cc
2.
This figure is the volume of the syringe, plus the volume of the attached tubing:
Volume of tubing = 62.8 cc - 60.0 cc = 2.8 cc
3.
The y-intercept of the best-fit line, 2.68 cc, is also the volume of gas in the tubing. In this case the two values deviate by
about 0.1 cc.
1. n = slope/R. Pay attention to units in this calculation.
2. The ratio of slopes is 1.51, close to the expected value of 1.5.
n
21.3 cc kPa K
8.31 J K mol
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0.0213 J K
8.31 J K mol
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2.56 10
3
–
mol
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