ing carbon diox- 6.60 Carbon disulfide burns in air, produ ide and sulfur dioxide. CS:() + 30,(g) → CO2(g) + 2SO2(g); AH =-1077 k What is AH for the following equation? CS:() + ço-(2) + SO,(g) →
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.
![**6.60** Carbon disulfide burns in air, producing carbon dioxide and sulfur dioxide.
\[ \text{CS}_2(l) + 3\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{SO}_2(g); \quad \Delta H = -1077 \, \text{kJ} \]
What is \( \Delta H \) for the following equation?
\[ \frac{1}{2}\text{CO}_2(g) + \text{SO}_2(g) \rightarrow \frac{1}{2}\text{CS}_2(l) + \frac{3}{2}\text{O}_2(g) \]
**Explanation:**
- The original reaction is the combustion of carbon disulfide (\(\text{CS}_2\)) with oxygen (\(\text{O}_2\)), resulting in the formation of carbon dioxide (\(\text{CO}_2\)) and sulfur dioxide (\(\text{SO}_2\)). The enthalpy change (\(\Delta H\)) is \(-1077 \, \text{kJ}\).
- The second equation is the reverse of the original reaction with the coefficients halved. To find the enthalpy change for this reverse equation, the sign of \(\Delta H\) must be changed and the magnitude halved.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1bbb6bc4-7613-4ca2-bd6f-1a9e5f2e7def%2F286edd21-6139-47cc-8ac9-29667b12e81a%2Fqd99m2a_processed.jpeg&w=3840&q=75)
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