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Among the following the reaction that is accompanied by a decrease...

This question belongs to Engineering Chemistry Chemical Thermodynamics
Chemical Thermodynamics
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Among the following, the reaction that is accompanied by a decrease in the entropy is

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Correct Answer: Option A
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Standard entropy of crystalline carbon monoxide (in kJ/mol) at 0 K is around
A. 0.03 B. 2.50 C. zero D. 5.76
For an irreversible adiabatic expansion of a perfect gas from volume Vi to Vf, the change in entropy of the gas is
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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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