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For the reaction N2(g) + 3H2(g) 2NH3(g) compute the entropy change...

This question belongs to Engineering Chemistry Chemical Thermodynamics
Chemical Thermodynamics
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For the reaction, N2(g) + 3H2(g) → 2NH3(g)
compute the entropy change (in J/K/mol) for the process and comment on the sign of the property.
Data Species
S°(J/K/mol)		 NH3(g)
192.3		 N2(g)
191.5		 H2(g)
130.6

Answer & Solution
Correct Answer: Option B
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For the reaction, N2(g) + 3H2(g) → 2NH3(g)
compute the entropy change (in J/K/mol) for the process and comment on the sign of the property.
Data Species
S°(J/K/mol)		 NH3(g)
192.3		 N2(g)
191.5		 H2(g)
130.6
A. ΔS° = -37.65 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction B. ΔS° = -198.7 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction C. ΔS° = -31.25 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction D. ΔS° = +31.25 J/K/mol; positive sign indicates that the reaction is spontaneous
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