Use the data to find AHn for the reaction. 2 NO2(g) =2 NO(g) + O2(g) Express your answer in kilojoules per mole. The data in the table show the equilibrium constant for this reaction measured at several different temperatures. > View Available Hint(s) Temperature Kp 170 K 3.8 x 10-3 ? 180 K 0.34 190 K 18.4 ΔΗ kJ 200 K 681 Submit • Part B Use the data to find ASm for the reaction. Express your answer in joules per mole.

Use the data to find AHn for the reaction. 2 NO2(g) =2 NO(g) + O2(g) Express your answer in kilojoules per mole. The data in the table show the equilibrium constant for this reaction measured at several different temperatures. > View Available Hint(s) Temperature Kp 170 K 3.8 x 10-3 ? 180 K 0.34 190 K 18.4 ΔΗ kJ 200 K 681 Submit • Part B Use the data to find ASm for the reaction. Express your answer in joules per mole.

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

Chapter13: Spontaneous Processes And Thermodynamic Equilibrium

Section: Chapter Questions

Problem 19P

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The evaporation of one mole of water at 298 K has a standard free allergy change of 8.58 kJ. H2O(l)H2O(g)G298=8.58kJ (a) Is the evaporation of water under standard thermodynamic conditions spontaneous?. (b) Determine the equilibrium constant, KP, for this physical process. (c) By calculating G, determine if the evaporation of water at 298 K is spontaneous when the partial pressure of water, PH2O, is 0.011 atm.. (d) If the evaporation of water were always nonspontaneous at room temperature, wet laundry would never dry when placed outside. In order for laundry to dry, what must be the value of PH2O in the air?
The free energy change, G, for a process at constant temperature and pressure is related to Suniv and reflects the spontaneity of the process. How is G related to Suniv? When is a process spontaneous? Nonspontaneous? At equilibrium? G is a composite term composed of H, T, and S. What is the G equation? Give the four possible sign combinations for H and S. What temperatures are required for each sign combination to yield a spontaneous process? If G is positive, what does it say about the reverse process? How does the G = H TS equation reduce when at the melting-point temperature of a solid-to-liquid phase change or at the boiling-point temperature of a liquid-to-gas phase change? What is the sign of G for the solid-to-liquid phase change at temperatures above the freezing point? What is the sign of G for the liquid-to-gas phase change at temperatures below the boiling point?
At 1 atm, liquid water is heated above 100C. For this process, which of the following choices (iiv) is correct for Ssurr? S? Suniv? Explain each answer. i. greater than zero ii. less than zero iii. equal to zero iv. cannot be determined
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