CH,(9) + 2 0,(g) AH = -809.0 kJ/mol Co,(g) + 2 H,0(g) AH = -81.3 kJ cond 2 H,0() Given the energy diagram above, what is AH when two moles of methane are combusted?

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### Energy Diagram Description:

**Reactions:**

1. **Combustion of Methane:**
   - **Reactants:** \( \text{CH}_4(g) + 2 \text{O}_2(g) \)
   - **Products:** \( \text{CO}_2(g) + 2 \text{H}_2\text{O}(g) \)
   - **Enthalpy Change (\( \Delta H_{\text{rxn}} \))**: -809.0 kJ/mol 

2. **Condensation of Water:**
   - **Reactants:** \( 2 \text{H}_2\text{O}(g) \)
   - **Products:** \( 2 \text{H}_2\text{O}(l) \)
   - **Enthalpy Change (\( \Delta H_{\text{cond}} \))**: -81.3 kJ

### Question:

**Given the energy diagram above, what is \( \Delta H \) when two moles of methane are combusted?**

### Answer Choices:

- ○ -401.15 kJ
- ○ +1604.6 kJ
- ○ -802.3 kJ
- ◎ +802.3 kJ
- ○ +401.15 kJ
- ○ -1604.6 kJ

**Correct Answer:** +802.3 kJ

### Explanation:

To find the total enthalpy change when two moles of methane are combusted, consider the enthalpy changes involved. This includes two moles undergoing the reaction and subsequent changes in the state of water produced.
Transcribed Image Text:### Energy Diagram Description: **Reactions:** 1. **Combustion of Methane:** - **Reactants:** \( \text{CH}_4(g) + 2 \text{O}_2(g) \) - **Products:** \( \text{CO}_2(g) + 2 \text{H}_2\text{O}(g) \) - **Enthalpy Change (\( \Delta H_{\text{rxn}} \))**: -809.0 kJ/mol 2. **Condensation of Water:** - **Reactants:** \( 2 \text{H}_2\text{O}(g) \) - **Products:** \( 2 \text{H}_2\text{O}(l) \) - **Enthalpy Change (\( \Delta H_{\text{cond}} \))**: -81.3 kJ ### Question: **Given the energy diagram above, what is \( \Delta H \) when two moles of methane are combusted?** ### Answer Choices: - ○ -401.15 kJ - ○ +1604.6 kJ - ○ -802.3 kJ - ◎ +802.3 kJ - ○ +401.15 kJ - ○ -1604.6 kJ **Correct Answer:** +802.3 kJ ### Explanation: To find the total enthalpy change when two moles of methane are combusted, consider the enthalpy changes involved. This includes two moles undergoing the reaction and subsequent changes in the state of water produced.
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