What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to the following reaction Mg(s) + O2(g) → MgO(s) AH = -1204 kJ
What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to the following reaction Mg(s) + O2(g) → MgO(s) AH = -1204 kJ
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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![**Question 15 of 15**
**Topic: Thermodynamics - Enthalpy Change in Reactions**
**Problem Statement:**
Calculate the change in enthalpy (in kilojoules) when 2.30 moles of magnesium (Mg) react completely according to the following reaction:
\[ 2 \text{Mg(s)} + \text{O}_2\text{(g)} \rightarrow 2 \text{MgO(s)} \]
The enthalpy change (\( \Delta H \)) for the reaction is given as \(-1204 \text{ kJ}\).
**Calculation Steps:**
1. **Starting Amount:** Input the amount of Mg reacting (2.30 mol) into the left box labeled "STARTING AMOUNT."
2. **Use the Reaction Stoichiometry:**
- The balanced chemical equation shows that 2 moles of Mg produce an enthalpy change of \(-1204 \text{ kJ}\).
3. **Calculate the Enthalpy Change for 2.30 mol of Mg:**
- Input the appropriate values into the provided equation format:
\[
\text{Enthalpy Change} = \left( \frac{\text{Starting Amount (moles)}}{\text{Stoichiometric Coefficient (moles)}} \right) \times \Delta H_{\text{reaction}}
\]
- Here:
- Starting Amount = 2.30 mol
- Stoichiometric Coefficient = 2 mol
- \(\Delta H_{\text{reaction}} = -1204 \text{ kJ}\)
4. **Compute the Enthalpy Change:**
- Use the provided calculation tools to find the final enthalpy change.
**Interface:**
- A calculation field and result display panel are included for user input and solving.
- Below the calculation interface are options to adjust factors and reset the input.
**Additional Resources:**
- Click on the provided link for more learning materials about enthalpy and thermodynamics.
This problem helps deepen understanding of reaction enthalpy changes, particularly in calculating real-world chemical energy changes from stoichiometric ratios.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F743e1204-284e-4787-9cb1-b6fdc93e0afd%2F6ec6b9dd-28b0-4bea-ad27-98a2b713c577%2F6n9039v_processed.png&w=3840&q=75)
Transcribed Image Text:**Question 15 of 15**
**Topic: Thermodynamics - Enthalpy Change in Reactions**
**Problem Statement:**
Calculate the change in enthalpy (in kilojoules) when 2.30 moles of magnesium (Mg) react completely according to the following reaction:
\[ 2 \text{Mg(s)} + \text{O}_2\text{(g)} \rightarrow 2 \text{MgO(s)} \]
The enthalpy change (\( \Delta H \)) for the reaction is given as \(-1204 \text{ kJ}\).
**Calculation Steps:**
1. **Starting Amount:** Input the amount of Mg reacting (2.30 mol) into the left box labeled "STARTING AMOUNT."
2. **Use the Reaction Stoichiometry:**
- The balanced chemical equation shows that 2 moles of Mg produce an enthalpy change of \(-1204 \text{ kJ}\).
3. **Calculate the Enthalpy Change for 2.30 mol of Mg:**
- Input the appropriate values into the provided equation format:
\[
\text{Enthalpy Change} = \left( \frac{\text{Starting Amount (moles)}}{\text{Stoichiometric Coefficient (moles)}} \right) \times \Delta H_{\text{reaction}}
\]
- Here:
- Starting Amount = 2.30 mol
- Stoichiometric Coefficient = 2 mol
- \(\Delta H_{\text{reaction}} = -1204 \text{ kJ}\)
4. **Compute the Enthalpy Change:**
- Use the provided calculation tools to find the final enthalpy change.
**Interface:**
- A calculation field and result display panel are included for user input and solving.
- Below the calculation interface are options to adjust factors and reset the input.
**Additional Resources:**
- Click on the provided link for more learning materials about enthalpy and thermodynamics.
This problem helps deepen understanding of reaction enthalpy changes, particularly in calculating real-world chemical energy changes from stoichiometric ratios.
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