Enthalpy is the energy absorbed or released when a chemical change occurs. Assume you have the following thermochemical reaction: 2H2S(9) + 302(g) -> 2SO2(g) + 2H2O(g); AH = -1036 KJ How much energy is absorbed or released when 19.6 g of hydrogen sulfide (H2S) is burned? Is this an exothermic or endothermic reaction? Show all work for full credit.

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**Thermochemical Reaction and Enthalpy Explanation**

Enthalpy is the energy absorbed or released when a chemical change occurs. Consider the following thermochemical reaction:

\[ 2\text{H}_2\text{S}_{(g)} + 3\text{O}_2_{(g)} \rightarrow 2\text{SO}_2_{(g)} + 2\text{H}_2\text{O}_{(g)}; \quad \Delta H = -1036 \text{ kJ} \]

**Problem Statement:**

How much energy is absorbed or released when 19.6 g of hydrogen sulfide (H₂S) is burned? Is this an exothermic or endothermic reaction?

*Note:* Show all work for full credit.

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**Explanation:**

- The reaction given indicates that 2 moles of H₂S gas react with 3 moles of O₂ gas to produce 2 moles of SO₂ gas and 2 moles of H₂O gas.
- The change in enthalpy (\(\Delta H\)) for the reaction is \(-1036 \text{ kJ}\), indicating that the reaction releases energy.
- Determine if this process is exothermic or endothermic. 

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An exothermic reaction releases energy (negative \(\Delta H\)), whereas an endothermic reaction absorbs energy (positive \(\Delta H\)).
Transcribed Image Text:**Thermochemical Reaction and Enthalpy Explanation** Enthalpy is the energy absorbed or released when a chemical change occurs. Consider the following thermochemical reaction: \[ 2\text{H}_2\text{S}_{(g)} + 3\text{O}_2_{(g)} \rightarrow 2\text{SO}_2_{(g)} + 2\text{H}_2\text{O}_{(g)}; \quad \Delta H = -1036 \text{ kJ} \] **Problem Statement:** How much energy is absorbed or released when 19.6 g of hydrogen sulfide (H₂S) is burned? Is this an exothermic or endothermic reaction? *Note:* Show all work for full credit. --- **Explanation:** - The reaction given indicates that 2 moles of H₂S gas react with 3 moles of O₂ gas to produce 2 moles of SO₂ gas and 2 moles of H₂O gas. - The change in enthalpy (\(\Delta H\)) for the reaction is \(-1036 \text{ kJ}\), indicating that the reaction releases energy. - Determine if this process is exothermic or endothermic. --- An exothermic reaction releases energy (negative \(\Delta H\)), whereas an endothermic reaction absorbs energy (positive \(\Delta H\)).
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