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The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, ΔH, changes sign when a process is reversed. Consider the reaction H2O(l)→H2O(g), ΔH =44.0kJ What will ΔH be for the reaction if it is reversed?

The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, ΔH, changes sign when a process is reversed. Consider the reaction H2O(l)→H2O(g), ΔH =44.0kJ What will ΔH be for the reaction if it is reversed?

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
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The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, ΔH, changes sign when a process is reversed.

Consider the reaction

H2O(l)→H2O(g), ΔH =44.0kJ

What will ΔH be for the reaction if it is reversed?

N2 (g) + O2 (g) → 2NO (g) AH = 180.5 kJ AH is an Extensive Property (g) NO (g) AH = 90.25 kJ AH Changes sign when a process is reversed 2NO(g) → N2(g) + O2 (g) AH - 180.5 kJ 글N2 (g) + 글02 (g) → NQ (g) AH = 90.25 kJ Hess's Law of Constant Heat Summation. NO (g) + 02 (g) → NO2 (g) AH = - 57.05 kJ N2 (g) + O2 (g) → NO2 (g) AH = 33.20 kJ When two reactions are added together, the individual reaction enthalpies are summed. Notice that equal quantities of the same species, on both sides of the reaction arrow, cancel.
Transcribed Image Text:N2 (g) + O2 (g) → 2NO (g) AH = 180.5 kJ AH is an Extensive Property (g) NO (g) AH = 90.25 kJ AH Changes sign when a process is reversed 2NO(g) → N2(g) + O2 (g) AH - 180.5 kJ 글N2 (g) + 글02 (g) → NQ (g) AH = 90.25 kJ Hess's Law of Constant Heat Summation. NO (g) + 02 (g) → NO2 (g) AH = - 57.05 kJ N2 (g) + O2 (g) → NO2 (g) AH = 33.20 kJ When two reactions are added together, the individual reaction enthalpies are summed. Notice that equal quantities of the same species, on both sides of the reaction arrow, cancel.
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