Chapter 19: Q. 5 (page 543)
Why is the molar specific heat of a gas at constant pressure larger than the molar specific heat at constant volume?
The value of molar specific heat at constant pressure is greater than the value of molar specific heat at constant pressure as the work done increases at constant pressure.
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500 J of work are done on a system in a process that decreases the system’s thermal energy by 200 J. How much heat energy is transferred to or from the system?
A rapidly spinning paddle wheel raises the temperature of 200 mL of water from 21°C to 25°C. How much
(a) heat is transferred and
(b) work is done in this process?
Draw a first-law bar chart (see Figure 19.12) for the gas process in Figure EX19.9
of nitrogen gas at and an initial pressure of undergo an isobaric expansion until the volume has tripled.
a. What are the gas volume and temperature after the expansion?
b. How much heat energy is transferred to the gas to cause this expansion?
The gas pressure is then decreased at constant volume until the original temperature is reached.
c. What is the gas pressure after the decrease?
d. What amount of heat energy is transferred from the gas as its pressure decreases?
e. Show the total process on a diagram. Provide an appropriate scale on both axes.
FIGURE P19.62 shows a thermodynamic process followed by of helium.
a. Determine the pressure (in ), temperature (in ), and volume in of the gas at points 1,2 , and 3 . Put your results in a table for easy reading.
b. How much work is done on the gas during each of the three segments?
c. How much heat energy is transferred to or from the gas during each of the three segments?
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