10. Hydrogen gas is an important industrial molecule used in the production of many other compounds (for example the Haber-Bosch production of ammonia). The following exothermic reactions of methane and water is used industrially to produce H₂ gas. CH₂(g) + H₂O (g) 3 H₂(g) + CO (g) AH=206 kJ/mol a. Using the axes below, draw a potential energy diagram for the production of hydrogen gas using the above reaction. b. Draw a second line representing the same reaction with a catalyst.
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.
![### Hydrogen Gas: Industrial Production and Reactions
#### Introduction:
Hydrogen gas is an essential industrial molecule used extensively in the production of various compounds, such as in the Haber-Bosch process for ammonia production.
#### Reactions:
One of the primary industrial methods for producing hydrogen gas (H₂) involves the exothermic reaction of methane (CH₄) and water (H₂O).
#### Chemical Equation:
\[ \text{CH}_4(g) + \text{H}_2\text{O}(g) \rightarrow 3 \text{H}_2(g) + \text{CO}(g) \]
This reaction releases energy with an enthalpy change (ΔH) of 206 kJ per mole.
#### Tasks:
a. **Potential Energy Diagram**:
Using the provided chemical reaction, draw a potential energy diagram. The diagram should show the energy changes during the reaction:
1. The y-axis represents potential energy.
2. The x-axis represents the progress of the reaction from reactants to products.
3. Indicate the energy of the reactants (CH₄ and H₂O) and the products (H₂ and CO).
4. Highlight the difference in energy, showing that the reaction is exothermic.
b. **Effect of a Catalyst**:
Draw a second line on the same diagram to represent the reaction with a catalyst. The catalyst lowers the activation energy but does not change the reactants' or products' potential energies.
#### Explanation:
- A potential energy diagram visually represents the energy levels of reactants and products during a chemical reaction.
- In an exothermic reaction, the potential energy of the products is lower than that of the reactants, resulting in energy release.
- When a catalyst is present, it reduces the activation energy required for the reaction without altering the initial and final energy states, thereby increasing the reaction rate.
By understanding these diagrams, students can better comprehend the energy dynamics involved in chemical reactions, particularly those industrially relevant like the production of hydrogen gas.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fabf7f939-657a-4cb9-aa9d-1310fbdc7d61%2F89800f50-ebc3-4ab9-a47c-6cc999611aed%2Fchjttj6_processed.jpeg&w=3840&q=75)
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