Entropy Example: If AS°¸ =-198.3 J/K, is the reaction spontaneous at 25°C sys N2 + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AHsys)/T Determine the AHrxn • AH˚4 N2(g) = 0 kJ/mol f • AH°+ H2(g) = 0 kJ/mol f • AH° NH 3(g) = -46.19 kJ/mol f

Entropy Example: If AS°¸ =-198.3 J/K, is the reaction spontaneous at 25°C sys N2 + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AHsys)/T Determine the AHrxn • AH˚4 N2(g) = 0 kJ/mol f • AH°+ H2(g) = 0 kJ/mol f • AH° NH 3(g) = -46.19 kJ/mol f

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

Section: Chapter Questions

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

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Question

Entropy
Example: If AS°¸ =-198.3 J/K, is the reaction spontaneous
at 25°C
sys
N2 + 3H2 → 2NH3
• AS univ = AS sys + AS surr > ?
• AS surr =-(AHsys)/T
Determine the AHrxn
• AH˚4 N2(g) = 0 kJ/mol
f
• AH°+ H2(g) = 0 kJ/mol
f
• AH° NH 3(g) = -46.19 kJ/mol
f

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Entropy Example: If AS°¸ =-198.3 J/K, is the reaction spontaneous at 25°C sys N2 + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AHsys)/T Determine the AHrxn • AH˚4 N2(g) = 0 kJ/mol f • AH°+ H2(g) = 0 kJ/mol f • AH° NH 3(g) = -46.19 kJ/mol f
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Determine the AHrxn • AH° N2(g) = 0 kJ/mol • AH°+ H2(g) = 0 kJ/mol • AH˚ NH3(g) = -46.19 kJ/mol о