A student dissolves 15.0 g of sodium hydroxide (NaOH)in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.5 °C over the course of 4.2 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaOH (s) Na' (ag) + он (аq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. exothermic Is this reaction exothermic, endothermic, or neither? O endothermic O neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. | kJ kJ Calculate the reaction enthalpy AH per mole of NaOH. rxn mol
A student dissolves 15.0 g of sodium hydroxide (NaOH)in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.5 °C over the course of 4.2 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaOH (s) Na' (ag) + он (аq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. exothermic Is this reaction exothermic, endothermic, or neither? O endothermic O neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. | kJ kJ Calculate the reaction enthalpy AH per mole of NaOH. rxn mol
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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![**Activity Overview: Thermodynamic Analysis of NaOH Dissolution**
A student dissolves 15.0 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.5 °C over the course of 4.2 minutes.
**Chemical Equation:**
\[ \text{NaOH(s)} \rightarrow \text{Na}^+ \text{(aq)} + \text{OH}^- \text{(aq)} \]
Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:
You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits.
*Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.*
---
**Questions and Calculations:**
1. **Is this reaction exothermic, endothermic, or neither?**
- [ ] exothermic
- [ ] endothermic
- [ ] neither
2. **If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.**
- [ ] \( \_\_\_\_\_ \, \text{kJ} \)
3. **Calculate the reaction enthalpy \( \Delta H_{\text{rxn}} \) per mole of NaOH.**
- [ ] \( \_\_\_\_\_ \, \frac{\text{kJ}}{\text{mol}} \)
---
Be sure to record your findings and assumptions clearly, and use appropriate significant figures.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1e77a53e-015e-4d74-8706-0af5e82649c9%2Fed36645d-513a-41f3-89f8-66a03cc39101%2F7g43mg8_processed.png&w=3840&q=75)
Transcribed Image Text:**Activity Overview: Thermodynamic Analysis of NaOH Dissolution**
A student dissolves 15.0 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.5 °C over the course of 4.2 minutes.
**Chemical Equation:**
\[ \text{NaOH(s)} \rightarrow \text{Na}^+ \text{(aq)} + \text{OH}^- \text{(aq)} \]
Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:
You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits.
*Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.*
---
**Questions and Calculations:**
1. **Is this reaction exothermic, endothermic, or neither?**
- [ ] exothermic
- [ ] endothermic
- [ ] neither
2. **If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.**
- [ ] \( \_\_\_\_\_ \, \text{kJ} \)
3. **Calculate the reaction enthalpy \( \Delta H_{\text{rxn}} \) per mole of NaOH.**
- [ ] \( \_\_\_\_\_ \, \frac{\text{kJ}}{\text{mol}} \)
---
Be sure to record your findings and assumptions clearly, and use appropriate significant figures.
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