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Consider the dissociation of methane, CH4(g), into the elements H2(g) and C(s, graphite). (a) Given that ΔfH⦵(CH4,g) = −74.85 kJ mol−1 and that ΔfS⦵ = −80.67 J K−1 mol−1 at 298 K, calculate the value of the equilibrium constant at 298 K. (b) Assuming that ΔrH⦵ is independent of temperature, calculate K at 50 °C. (c) Calculate the degree of dissociation, α, of methane at 298 K and a total pressure of 0.010 bar. (d) Without doing any numerical calculations, explain how the degree of dissociation for this reaction will change as the pressure and temperature are varied.

Consider the dissociation of methane, CH4(g), into the elements H2(g) and C(s, graphite). (a) Given that ΔfH⦵(CH4,g) = −74.85 kJ mol−1 and that ΔfS⦵ = −80.67 J K−1 mol−1 at 298 K, calculate the value of the equilibrium constant at 298 K. (b) Assuming that ΔrH⦵ is independent of temperature, calculate K at 50 °C. (c) Calculate the degree of dissociation, α, of methane at 298 K and a total pressure of 0.010 bar. (d) Without doing any numerical calculations, explain how the degree of dissociation for this reaction will change as the pressure and temperature are varied.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
Section: Chapter Questions
Problem 90QAP: Consider a metal ion A2+ and its nitrate salt, In an experiment, 35.00 mL of a 0.217 M solution of...
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Consider the dissociation of methane, CH4(g), into the elements H2(g) and C(s, graphite). (a) Given that ΔfH⦵(CH4,g) = −74.85 kJ mol−1 and that ΔfS⦵ = −80.67 J K−1 mol−1 at 298 K, calculate the value of the equilibrium constant at 298 K. (b) Assuming that ΔrH⦵ is independent of temperature, calculate K at 50 °C. (c) Calculate the degree of dissociation, α, of methane at 298 K and a total pressure of 0.010 bar. (d) Without doing any numerical calculations, explain how the degree of dissociation for this reaction will change as the pressure and temperature are varied.

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