# Gas measuring Mercury tube reservoir Pressure gauge valve gas in Rubber M ercury in tube gas measuring containing tube mercury Figure 1 Figure 2 Relationship between P and T when n and V are constant 2. In the apparatus shown in Figure 2., a metal bulb containing a sample of 0.20 g of helium is connected to a pressure gauge which records pressure in pounds per square inch. The metal bulb is immersed in a bath in which the temperature can be adjusted and maintained. The pressure is determined at four easily maintained, fixed temperatures: boiling water, room temperature, melting ice, and the melting temperature of dry ice (CO2 (s)). Exercise 2. Relationship between P and T when n and V are constant. Complete the data table (temperature and pressure) below for 0.20 g of helium (0.050 mol) at a constant volume of 1.12 L. Plot the pressure in atmospheres on the ordinate (range 0 atm to 1.50 atm), and Celsius temperature (range-100°C to +100 C) on the abscissa. Extrapolate the line connecting the points to zero pressure, and note where it intersects the temperature axis. Temperature P/T Pressure (atm/K) (K) ab/in2) (atm) 100.0 19.9 30.0 16.2 14.6 0.0 10.4 -79.0 Now, calculate the P/T ratio (this is the proportionality constant, k), for each temperature and pressure value and fill in the column in the table. Complete the statements below: Statements: The name of the curve you graphed is 1. The mathematical expression relating P and T is 2. The temperature at which the line intersects the temperature axis is 3. The pressure exerted by 0.20 g of He at 200 C would be (Show your calculation in the space below.) 4. | ! 1 1

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10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning   