3. Methanol is finding increased acceptance as an alternative fuel. The combustion is given by the following unbalanced reaction: CH3OH (1) + O2 (g) → CO2 (g) + H2O (g) a) What is the change of enthalpy for the reaction if AH CH3OH (1) = -238.6 kJ/mol AH CO2 (g) =-393.5 kJ/mol AH H2O (g) = -241.8 kJ/mol
3. Methanol is finding increased acceptance as an alternative fuel. The combustion is given by the following unbalanced reaction: CH3OH (1) + O2 (g) → CO2 (g) + H2O (g) a) What is the change of enthalpy for the reaction if AH CH3OH (1) = -238.6 kJ/mol AH CO2 (g) =-393.5 kJ/mol AH H2O (g) = -241.8 kJ/mol
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Question 5: parts a, b, and c.
![**Transcription for Educational Website**
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**5. Methanol as an Alternative Fuel**
Methanol is gaining acceptance as an alternative fuel. The following unbalanced chemical reaction represents its combustion:
\[ \text{CH}_3\text{OH (l)} + \text{O}_2\text{ (g)} \rightarrow \text{CO}_2\text{ (g)} + \text{H}_2\text{O (g)} \]
**a) Enthalpy Change Calculation:**
To determine the change in enthalpy (\( \Delta H \)) for the reaction, the following standard enthalpy values (kJ/mol) are considered:
- \( \Delta H_f^\circ \text{CH}_3\text{OH (l)} = -238.6 \, \text{kJ/mol} \)
- \( \Delta H_f^\circ \text{CO}_2\text{ (g)} = -393.5 \, \text{kJ/mol} \)
- \( \Delta H_f^\circ \text{H}_2\text{O (g)} = -241.8 \, \text{kJ/mol} \)
**b) Enthalpy Change for 252 ml of Methanol:**
Calculate the enthalpy change when 252 ml of methanol (density = 0.924 g/ml) is combusted completely.
**c) Enthalpy Diagram Construction:**
Below is a typical enthalpy diagram for the reaction:
- **Diagram Description:**
- **Axes:** The vertical axis represents enthalpy (\( \Delta H \)), while the horizontal axis represents time.
- **Curve:** The curve starts at point R (reactants) with higher enthalpy, drops to point P (products) with lower enthalpy, indicating an exothermic reaction.
The diagram illustrates the decrease in enthalpy over time during the combustion of methanol.
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This transcription provides clarity on methanol combustion, enthalpy changes, and offers an illustrative graph to aid in understanding the reaction dynamics.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff6eb23d2-7204-4d4d-a69d-d55edfd24a24%2F6c18e3a5-4241-4e98-bfc7-7670aa6cf9f6%2F6bbec1g.jpeg&w=3840&q=75)
Transcribed Image Text:**Transcription for Educational Website**
---
**5. Methanol as an Alternative Fuel**
Methanol is gaining acceptance as an alternative fuel. The following unbalanced chemical reaction represents its combustion:
\[ \text{CH}_3\text{OH (l)} + \text{O}_2\text{ (g)} \rightarrow \text{CO}_2\text{ (g)} + \text{H}_2\text{O (g)} \]
**a) Enthalpy Change Calculation:**
To determine the change in enthalpy (\( \Delta H \)) for the reaction, the following standard enthalpy values (kJ/mol) are considered:
- \( \Delta H_f^\circ \text{CH}_3\text{OH (l)} = -238.6 \, \text{kJ/mol} \)
- \( \Delta H_f^\circ \text{CO}_2\text{ (g)} = -393.5 \, \text{kJ/mol} \)
- \( \Delta H_f^\circ \text{H}_2\text{O (g)} = -241.8 \, \text{kJ/mol} \)
**b) Enthalpy Change for 252 ml of Methanol:**
Calculate the enthalpy change when 252 ml of methanol (density = 0.924 g/ml) is combusted completely.
**c) Enthalpy Diagram Construction:**
Below is a typical enthalpy diagram for the reaction:
- **Diagram Description:**
- **Axes:** The vertical axis represents enthalpy (\( \Delta H \)), while the horizontal axis represents time.
- **Curve:** The curve starts at point R (reactants) with higher enthalpy, drops to point P (products) with lower enthalpy, indicating an exothermic reaction.
The diagram illustrates the decrease in enthalpy over time during the combustion of methanol.
---
This transcription provides clarity on methanol combustion, enthalpy changes, and offers an illustrative graph to aid in understanding the reaction dynamics.
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