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.
![**Exercise: Calculating Standard Enthalpy Change**
**Objective:**
Use the standard heats of formation to calculate the standard enthalpy change for the following reaction:
\[ \text{NH}_4\text{Cl(aq)} \rightarrow \text{NH}_3\text{(g)} + \text{HCl(aq)} \]
**Required:**
Enter your answer in the provided box in kilojoules (kJ).
**Interface Elements:**
- **Answer Box:** Enter the calculated enthalpy change in kJ.
- **Submit Answer Button:** Click this to submit your answer for evaluation.
- **Retry Entire Group Button:** Use this option if you wish to attempt the problem again.
- **Attempt Counter:** Indicates that 9 more group attempts are remaining.
**Note:** Always refer to the data for standard heats of formation provided in your textbook or educational materials to complete the calculation accurately.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F419cf81b-048b-4473-a6fc-ac1b06aa6ecf%2Fd8719ad4-bbe4-4999-abc1-7a85eb01512d%2Fud0ugr9_processed.jpeg&w=3840&q=75)
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