Under the standard state and 260 oC, the solid of ammonia hydroxide NH4OH (s) decomposes explosively on its own into nitrous oxide gas N2O (g) and water-gas H2O (g). NH4OH (s) à NH3 (g) + H2O (g) However, NH4OH (s) is stable under the standard state and 25 oC and does not decompose. Based on the above information, which of the following does have the correct signs for the ∆Gorxn, ∆Horxn, and ∆Sorxn regarding the above reaction at the standard state and 260 oC? (Choose one option only.) Options:
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Under the standard state and 260 oC, the solid of ammonia hydroxide NH4OH (s) decomposes explosively on its own into nitrous oxide gas N2O (g) and water-gas H2O (g).
NH4OH (s) à NH3 (g) + H2O (g)
However, NH4OH (s) is stable under the standard state and 25 oC and does not decompose.
Based on the above information, which of the following does have the correct signs for the ∆Gorxn, ∆Horxn, and ∆Sorxn regarding the above reaction at the standard state and 260 oC? (Choose one option only.)
Options:
a. ∆Horxn <0; ∆Sorxn < 0; ∆Gorxn < 0
b. ∆Horxn < 0; ∆Sorxn > 0; ∆Gorxn < 0
c. ∆Horxn > 0; ∆Sorxn < 0; ∆Gorxn < 0
d. ∆Horxn > 0; ∆Sorxn > 0; ∆Gorxn > 0
e. ∆Horxn < 0; ∆Sorxn > 0; ∆Gorxn > 0
f. ∆Horxn > 0; ∆Sorxn > 0; ∆Gorxn < 0
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