**Image Transcription for Educational Website:**The image illustrates an energy diagram for the combustion of methane:1. **Chemical Reaction:** - Reactants: CH₄(g) + 2 O₂(g) - Products: CO₂(g) + 2 H₂O(g)2. **Energy Changes:** - The reaction has an enthalpy change (ΔHᵣₓₙ) of -809.0 kJ/mol, indicating that energy is released. - There is an additional step where the gaseous water (2 H₂O(g)) condenses to liquid water (2 H₂O(l)), with an enthalpy change (ΔHₕₒₙᵈ) of -81.3 kJ.3. **Diagram Description:** - The diagram includes two horizontal lines: one representing the energy level of the reactants and another lower line for the energy level of the products. - Arrows indicate the transition from reactants to products and from gaseous to liquid water, both pointing downward, symbolizing the release of energy.4. **Question:** "Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic?"5. **Answer Options:** - endothermic - exothermic - it could be eitherThe diagram clearly shows that the combustion of methane is an exothermic process, as indicated by the negative enthalpy changes and the downward arrows showing the release of energy.

Combustion is the process of reaction of a hydrocarbon in presence of oxygen to form carbon dioxide…

CH,(g) + 2 0,(g) AH rxn = -809.0 kJ/mol co,(g) + 2 H,O(g) AH = -81.3 kJ cond 2 H,O(/) Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic? endothermic exothermic it could be either

CH,(g) + 2 0,(g) AH rxn = -809.0 kJ/mol co,(g) + 2 H,O(g) AH = -81.3 kJ cond 2 H,O(/) Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic? endothermic exothermic it could be either

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

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.

Question

**Image Transcription for Educational Website:**

The image illustrates an energy diagram for the combustion of methane:

1. **Chemical Reaction:**
- Reactants: CH₄(g) + 2 O₂(g)
- Products: CO₂(g) + 2 H₂O(g)

2. **Energy Changes:**
- The reaction has an enthalpy change (ΔHᵣₓₙ) of -809.0 kJ/mol, indicating that energy is released.
- There is an additional step where the gaseous water (2 H₂O(g)) condenses to liquid water (2 H₂O(l)), with an enthalpy change (ΔHₕₒₙᵈ) of -81.3 kJ.

3. **Diagram Description:**
- The diagram includes two horizontal lines: one representing the energy level of the reactants and another lower line for the energy level of the products.
- Arrows indicate the transition from reactants to products and from gaseous to liquid water, both pointing downward, symbolizing the release of energy.

4. **Question:**
"Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic?"

5. **Answer Options:**
- endothermic
- exothermic
- it could be either

The diagram clearly shows that the combustion of methane is an exothermic process, as indicated by the negative enthalpy changes and the downward arrows showing the release of energy.

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