User's Manual

Ideal Gas Law Apparatus Model No. TD-8596A
10
®
Answers to Questions on Page 5 of the Workbook:
3. 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:
Initial Volume = nRTP = (21.3 cc·kPaK) × (300 K)  (102 kPa) = 62.8 cc
4. 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
5. 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.
6. n = slope/R. Pay attention to units in this calculation.
7. The ratio of slopes is 1.51, close to the expected value of 1.5.
8. In theory the y-intercepts of
both slopes are equal because
they both represent the
volume of the tubing. In this
case they differ by 0.35 cc.
n
21.3 cc kPa K
8.31 J K mol
---------------------------------------
0.0213 J K
8.31 J K mol
------------------------------------
2.56 10
3–
 mol===