Which diagram below best represents the heating curve for ethanol? Physical Data for Ethanol 150 = -114.14 °C = 78.24 °C AHfus = 4.9 kJ/mol AHvap = 38.56 kJ/mol Tmp Tbp Cliquid ethanol Csolid ethanol Cgaseous ethanol 111.5 J/mol C = 112.4 J/mol C 78.28 J/mol C =

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C) Less than 100 °C because as the water gets hotter, it takes a greater amount of heat to raise the temperature by one degree.
D) 100 °C because that's the highest temperature liquid water can reach at 1 atm pressure.
E) The water will all boil away before that much heat can be added.
Transcribed Image Text:C) Less than 100 °C because as the water gets hotter, it takes a greater amount of heat to raise the temperature by one degree. D) 100 °C because that's the highest temperature liquid water can reach at 1 atm pressure. E) The water will all boil away before that much heat can be added.
**7. Which diagram below best represents the heating curve for ethanol?**

**Physical Data for Ethanol:**
- \( T_{\text{mp}} = -114.14 \, ^\circ \text{C} \)
- \( T_{\text{bp}} = 78.24 \, ^\circ \text{C} \)
- \( \Delta H_{\text{fus}} = 4.9 \, \text{kJ/mol} \)
- \( \Delta H_{\text{vap}} = 38.56 \, \text{kJ/mol} \)

- \( C_{\text{liquid ethanol}} = 111.5 \, \text{J/mol}^\circ\text{C} \)
- \( C_{\text{solid ethanol}} = 112.4 \, \text{J/mol}^\circ\text{C} \)
- \( C_{\text{gaseous ethanol}} = 78.28 \, \text{J/mol}^\circ\text{C} \)

**Diagrams A to E:**
- Each diagram is a graph with Temperature (°C) on the y-axis ranging from -150 to 150 and Heat added on the x-axis.

**8. 1026 kJ of heat is added to a sample of water at 1 atm pressure and the temperature rises from 40 °C to 80 °C. If 1026 kJ more heat is added, what will the final temperature of the water be?**

A) 120 °C because the water will continue to heat up at the same rate.

B) More than 100 °C but less than 120 °C because some of the heat will be used to boil the water.
Transcribed Image Text:**7. Which diagram below best represents the heating curve for ethanol?** **Physical Data for Ethanol:** - \( T_{\text{mp}} = -114.14 \, ^\circ \text{C} \) - \( T_{\text{bp}} = 78.24 \, ^\circ \text{C} \) - \( \Delta H_{\text{fus}} = 4.9 \, \text{kJ/mol} \) - \( \Delta H_{\text{vap}} = 38.56 \, \text{kJ/mol} \) - \( C_{\text{liquid ethanol}} = 111.5 \, \text{J/mol}^\circ\text{C} \) - \( C_{\text{solid ethanol}} = 112.4 \, \text{J/mol}^\circ\text{C} \) - \( C_{\text{gaseous ethanol}} = 78.28 \, \text{J/mol}^\circ\text{C} \) **Diagrams A to E:** - Each diagram is a graph with Temperature (°C) on the y-axis ranging from -150 to 150 and Heat added on the x-axis. **8. 1026 kJ of heat is added to a sample of water at 1 atm pressure and the temperature rises from 40 °C to 80 °C. If 1026 kJ more heat is added, what will the final temperature of the water be?** A) 120 °C because the water will continue to heat up at the same rate. B) More than 100 °C but less than 120 °C because some of the heat will be used to boil the water.
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