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.
Use average bond energies to calculate ΔH for the reaction of H2 and O2 to form water.
![**Chemical Reaction: Formation of Water**
This image represents a chemical equation illustrating the formation of water from hydrogen and oxygen. The equation is balanced as follows:
\[ \text{2H}_2 + \text{O}_2 \rightarrow \text{2H}_2\text{O} \]
**Explanation:**
- **Reactants**:
- \( \text{2H}_2 \): Two molecules of diatomic hydrogen.
- \( \text{O}_2 \): One molecule of diatomic oxygen.
- **Product**:
- \( \text{2H}_2\text{O} \): Two molecules of water are produced.
**Description**:
In this chemical reaction, two molecules of hydrogen gas (\( \text{H}_2 \)) react with one molecule of oxygen gas (\( \text{O}_2 \)) to form two molecules of water (\( \text{H}_2\text{O} \)). This reaction is an example of a combustion reaction where hydrogen is burned in oxygen to produce water, releasing energy. The equation is balanced to ensure the conservation of mass, showing that the number of each type of atom is the same on both sides of the equation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff6438823-d25c-4f57-b456-491c2d1fe2d2%2F622d3fc8-6f44-4dc7-9d74-bdcc53eb0b65%2Fm2zaifq_processed.png&w=3840&q=75)
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