Urine odor gets worse with time because urine contains the metabolic product urea [CO(NH2)21, a compound that is slowly converted to ammonia and carbon dioxide: co(NH,),(aq) + H,0(1) co, (aq) + 2NH, (aq) This reaction is much too slow for the enthalpy change to be measured directly using a temperature change. Instead, the enthalpy change for the reaction may be calculated from the following data: Compound Urea(aq) Co2(aq) H20(0 NH3(aq) AHF (kJ/mol) -319.2 -412.9 -285.9 -80.8 1st attempt See Periodic Table O See Hint Calculate AHrxn for the conversion of urea into ammonia.
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.
![Urine odor gets worse with time because urine contains the metabolic product urea [CO(NH₂)₂], a compound that is slowly converted to ammonia and carbon dioxide:
\[ \text{CO(NH}_2\text{)}_2 \, (\text{aq}) + \text{H}_2\text{O} \, (\text{l}) \rightarrow \text{CO}_2 \, (\text{aq}) + 2\text{NH}_3 \, (\text{aq}) \]
This reaction is much too slow for the enthalpy change to be measured directly using a temperature change. Instead, the enthalpy change for the reaction may be calculated from the following data:
| Compound | ΔHf° (kJ/mol) |
|----------------|---------------|
| Urea(aq) | -319.2 |
| CO₂(aq) | -412.9 |
| H₂O(l) | -285.9 |
| NH₃(aq) | -80.8 |
**1st attempt**
Calculate ΔHf°rxn for the conversion of urea into ammonia.
\[ \boxed{ \, \, \, \, \, } \, \text{kJ} \]
**Options:**
- [See Periodic Table]
- [See Hint]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc31825ca-e532-4346-8c67-c6f0bc8ad95c%2Fd18ecb9c-4a0f-43b6-aa77-2dc9c32f884d%2Fl02ovz_processed.jpeg&w=3840&q=75)
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