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 reactionH2O(l)→H2O(g), ΔH =44.0kJWhat will ΔH be for the reaction if it is reversed? N2 (g) + O2 (g) → 2NO (g) AH = 180.5 kJAH is an Extensive Property(g)NO (g) AH = 90.25 kJAH Changes sign when aprocess is reversed2NO(g) → N2(g) + O2 (g) AH- 180.5 kJ글N2 (g) + 글02 (g) →NQ (g) AH = 90.25 kJHess's Law of ConstantHeat Summation.NO (g) + 02 (g) → NO2 (g) AH = - 57.05 kJN2 (g) + O2 (g) → NO2 (g) AH = 33.20 kJWhen two reactions are added together,the individual reaction enthalpies aresummed. Notice that equal quantities ofthe same species, on both sides of thereaction arrow, cancel.

given, the reaction H2O(l)→H2O(g), ΔH =44.0kJ

Answered: The reaction that was on the screen…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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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.

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