Consider the following reaction: CaCO3 (s) CaO (s) + CO2 (g) ΔΗ = + 177.8 kJ According to Le Chatelier's Principle, what affect does removing some carbon dioxide have on the reaction? Less products are formed Shifts the reaction to the right to form more calcium carbonate Shifts the reaction to the right to form more products Shifts the reaction to the left to form more calcium carbonate
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.
![### Chemical Equilibrium and Le Chatelier's Principle
**Consider the following reaction:**
\[ \text{CaCO}_3 \ (s) \ \rightleftharpoons \ \text{CaO} \ (s) \ + \ \text{CO}_2 \ (g) \qquad \Delta H \ = \ +177.8 \ kJ \]
**According to Le Chatelier's Principle, what effect does removing some carbon dioxide have on the reaction?**
**Options:**
1. Less products are formed.
2. Shifts the reaction to the right to form more calcium carbonate.
3. Shifts the reaction to the right to form more products.
4. Shifts the reaction to the left to form more calcium carbonate.
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**Explanation:**
In the reaction given, calcium carbonate (CaCO\(_3\)) decomposes into calcium oxide (CaO) and carbon dioxide (CO\(_2\)). According to Le Chatelier's Principle, if a component of the reaction is removed, the system will adjust to counteract this change by shifting the equilibrium.
If carbon dioxide (CO\(_2\)) is removed from the system, the reaction will shift to the right to produce more carbon dioxide, thus forming more of the products (CaO and CO\(_2\)).
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**Answer:**
- Shifts the reaction to the right to form more products.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3e1f2a85-1db3-48f4-acfb-e624a8f47344%2F5028ccca-e6a7-4759-818a-219df5796d87%2Fpuhcnsm_processed.jpeg&w=3840&q=75)
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