25°C in a cylinder fitted with a movable piston expañds against a constant external pressure of 1.00 atm. At equilibrium, the pressure and volume of the gas are 1.00 atm and 23.5 L, respectively. (a) Calculate the final temperature of the sample. (b) Calculate the values of q, w, and AU for the process. 3.14 An ideal gas is compressed isothermally from 2.0 atm and 2.0 L to 4.0 atm and 1.0 L. Calculate the values of Δ U and ΔΗ if the process is carried out (a) reversibly and (b) irreversibly. 5 3.15 Explain the energy changes at the molecular level when liquid acetone is converted to vapor at its boiling point. 3.16 A piece of potassium metal is added to water in a beaker. The reaction that takes place is 2K (s) + 2H20) 2KOH (aq) + H2(g) Predict the signs of w, q,AU, and ΔΗ. 3.17 At 373.15 K and 1 atm, the molar volume of liquid water and steam are 1.88 x 10-5 m3 and 3.06 10-2 m, respectively. Given that the heat of vaporization of water is 40.79 kJ mol-1, calculate and Δ U for l mole in the following the values of process: H20(4,373.15 K, 1 atm) H20(g, 373.15 K, 1 atm)

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter12: Thermodynamic Processes And Thermochemistry
Section: Chapter Questions
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3.16

25°C in a cylinder fitted with a movable piston expañds
against a constant external pressure of 1.00 atm. At
equilibrium, the pressure and volume of the gas are
1.00 atm and 23.5 L, respectively. (a) Calculate the final
temperature of the sample. (b) Calculate the values of
q, w, and AU for the process.
3.14 An ideal gas is compressed isothermally from
2.0 atm and 2.0 L to 4.0 atm and 1.0 L. Calculate the
values of Δ U and ΔΗ if the process is carried out
(a) reversibly and (b) irreversibly.
5
3.15 Explain the energy changes at the molecular level
when liquid acetone is converted to vapor at its boiling
point.
3.16 A piece of potassium metal is added to water in a
beaker. The reaction that takes place is
2K (s) + 2H20) 2KOH (aq) + H2(g)
Predict the signs of w, q,AU, and ΔΗ.
3.17 At 373.15 K and 1 atm, the molar volume of
liquid water and steam are 1.88 x 10-5 m3 and
3.06 10-2 m, respectively. Given that the heat of
vaporization of water is 40.79 kJ mol-1, calculate
and Δ U for l mole in the following
the values of
process:
H20(4,373.15 K, 1 atm)
H20(g, 373.15 K, 1 atm)
Transcribed Image Text:25°C in a cylinder fitted with a movable piston expañds against a constant external pressure of 1.00 atm. At equilibrium, the pressure and volume of the gas are 1.00 atm and 23.5 L, respectively. (a) Calculate the final temperature of the sample. (b) Calculate the values of q, w, and AU for the process. 3.14 An ideal gas is compressed isothermally from 2.0 atm and 2.0 L to 4.0 atm and 1.0 L. Calculate the values of Δ U and ΔΗ if the process is carried out (a) reversibly and (b) irreversibly. 5 3.15 Explain the energy changes at the molecular level when liquid acetone is converted to vapor at its boiling point. 3.16 A piece of potassium metal is added to water in a beaker. The reaction that takes place is 2K (s) + 2H20) 2KOH (aq) + H2(g) Predict the signs of w, q,AU, and ΔΗ. 3.17 At 373.15 K and 1 atm, the molar volume of liquid water and steam are 1.88 x 10-5 m3 and 3.06 10-2 m, respectively. Given that the heat of vaporization of water is 40.79 kJ mol-1, calculate and Δ U for l mole in the following the values of process: H20(4,373.15 K, 1 atm) H20(g, 373.15 K, 1 atm)
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