The equilibrium constant at 25°C for the reaction 2 NO2(g) 2 N,O4(g) is 6.8. At 200°C the equilibrium constant is 1.21 × 10-3. Calculate the enthalpy change (AH) for this reaction, assuming that AH° and AS° of the reaction are constant over the temperature range from 25°C to 200°C.

The equilibrium constant at 25°C for the reaction 2 NO2(g) 2 N,O4(g) is 6.8. At 200°C the equilibrium constant is 1.21 × 10-3. Calculate the enthalpy change (AH) for this reaction, assuming that AH° and AS° of the reaction are constant over the temperature range from 25°C to 200°C.

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy

Section: Chapter Questions

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Question

The equilibrium constant at 25°C for the reaction
2 NO2(g) 2 N,O4(g)
is 6.8. At 200°C the equilibrium constant is 1.21 × 10-3.
Calculate the enthalpy change (AH) for this reaction,
assuming that AH° and AS° of the reaction are constant
over the temperature range from 25°C to 200°C.

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