Consider the reaction B(s) + O2(g)→B2O3(s), AH = -1270kJ What will AH be for the reaction if it is reversed?

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Chapter1: Chemical Foundations
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### Hess's Law Activity

#### Description:
- **Hess's Law of Constant Heat Summation:** When two reactions are added together, their individual reaction enthalpies are summed, provided the reactions occur under the same conditions.

#### Diagram Explanation:
The diagram illustrates two chemical reactions and their associated enthalpy changes (\( \Delta H \)):

1. **Reaction 1:**
   \[
   \text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g)
   \]
   - Shows the enthalpy change \( \Delta H \) as an extensive property.

2. **Reaction 2:**
   \[
   2\text{NO}(g) \rightarrow \text{N}_2(g) + \text{O}_2(g)
   \]
   - Illustrates that \( \Delta H \) changes sign when the reaction is reversed.

### Part B: Reaction Enthalpy Reversal

- **Prompt:**
  Click on the ΔH button within the activity to analyze the relationship between two displayed reactions. This demonstrates the reversal effect on reaction enthalpy, \( \Delta H \).

- **Consider the Reaction:**
  \[
  \text{B}(s) + \frac{3}{2}\text{O}_2(g) \rightarrow \text{B}_2\text{O}_3(s), \quad \Delta H = -1270\, \text{kJ}
  \]

- **Question:**
  What will \( \Delta H \) be if the reaction is reversed?

- **Instruction:**
  Express your answer with appropriate units.

**Input Box for Answer:**
- Value (in kJ)

**Available Hint(s):**
Click to view hints for further guidance.
Transcribed Image Text:### Hess's Law Activity #### Description: - **Hess's Law of Constant Heat Summation:** When two reactions are added together, their individual reaction enthalpies are summed, provided the reactions occur under the same conditions. #### Diagram Explanation: The diagram illustrates two chemical reactions and their associated enthalpy changes (\( \Delta H \)): 1. **Reaction 1:** \[ \text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g) \] - Shows the enthalpy change \( \Delta H \) as an extensive property. 2. **Reaction 2:** \[ 2\text{NO}(g) \rightarrow \text{N}_2(g) + \text{O}_2(g) \] - Illustrates that \( \Delta H \) changes sign when the reaction is reversed. ### Part B: Reaction Enthalpy Reversal - **Prompt:** Click on the ΔH button within the activity to analyze the relationship between two displayed reactions. This demonstrates the reversal effect on reaction enthalpy, \( \Delta H \). - **Consider the Reaction:** \[ \text{B}(s) + \frac{3}{2}\text{O}_2(g) \rightarrow \text{B}_2\text{O}_3(s), \quad \Delta H = -1270\, \text{kJ} \] - **Question:** What will \( \Delta H \) be if the reaction is reversed? - **Instruction:** Express your answer with appropriate units. **Input Box for Answer:** - Value (in kJ) **Available Hint(s):** Click to view hints for further guidance.
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