A student dissolves 11.8 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 20.0 °C to 33.6 °C over the course of 8 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 (aq) + OH (ag) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of 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. Is this reaction exothermic, endothermic, or 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. Calculate the reaction enthalpy AH per mole of NaOH. O exothermic O endothermic O neither KJ +0 mol x10 X

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Chapter1: Chemical Foundations
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A student dissolves 11.8 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 20.0 °C to 33.6 °C over the course of 8 minutes.

Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:

\[ \text{NaOH(s)} \rightarrow \text{Na}^+ (\text{aq}) + \text{OH}^- (\text{aq}) \]

You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of 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:**

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.

   \[ \_\_ \text{ kJ/mol} \]

There is a small diagram indicating the options for question 1, with a checkable list for exothermic, endothermic, or neither. Additionally, there is a small calculator icon beside the text fields for energy calculations.
Transcribed Image Text:A student dissolves 11.8 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 20.0 °C to 33.6 °C over the course of 8 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: \[ \text{NaOH(s)} \rightarrow \text{Na}^+ (\text{aq}) + \text{OH}^- (\text{aq}) \] You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of 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:** 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. \[ \_\_ \text{ kJ/mol} \] There is a small diagram indicating the options for question 1, with a checkable list for exothermic, endothermic, or neither. Additionally, there is a small calculator icon beside the text fields for energy calculations.
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