When a 4.25-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 22.0 °C to 16.9 °C. Part A Thermometer Calculate AH (in kJ/mol NH¼NO3) for the solution process Glass stirrer NH,NO3 (s) → NH; (aq) + NO, (aq) Assume that the specific heat of the solution is the same as that of pure water. Cork stopper Express your answer to two significant figures and include the appropriate units. ? Two Styrofoam cups nested together µA Reaction mixture in solution Value kJ / 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
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**Text Transcription for Educational Website**

**Experiment Description:**

When a 4.25-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 22.0 °C to 16.9 °C.

**Diagram Explanation:**

The image is a diagram of a coffee-cup calorimeter setup consisting of:
- A thermometer inserted into a cork stopper.
- A glass stirrer passing through the stopper into the solution.
- Two Styrofoam cups nested together to act as an insulating container.
- The reaction mixture in solution at the bottom of the cups.

**Problem Statement:**

**Part A**

Calculate the change in enthalpy (\( \Delta H \)) in kJ/mol for NH₄NO₃ in the solution process:

\[ \text{NH}_4\text{NO}_3 (s) \rightarrow \text{NH}_4^+ (aq) + \text{NO}_3^- (aq) \]

Assume that the specific heat of the solution is the same as that of pure water.

Express your answer to two significant figures and include the appropriate units.

**Answer Box:**

- Input field labeled "Value" with an attached unit label "kJ/mol" for the calculated enthalpy change.
Transcribed Image Text:**Text Transcription for Educational Website** **Experiment Description:** When a 4.25-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 22.0 °C to 16.9 °C. **Diagram Explanation:** The image is a diagram of a coffee-cup calorimeter setup consisting of: - A thermometer inserted into a cork stopper. - A glass stirrer passing through the stopper into the solution. - Two Styrofoam cups nested together to act as an insulating container. - The reaction mixture in solution at the bottom of the cups. **Problem Statement:** **Part A** Calculate the change in enthalpy (\( \Delta H \)) in kJ/mol for NH₄NO₃ in the solution process: \[ \text{NH}_4\text{NO}_3 (s) \rightarrow \text{NH}_4^+ (aq) + \text{NO}_3^- (aq) \] Assume that the specific heat of the solution is the same as that of pure water. Express your answer to two significant figures and include the appropriate units. **Answer Box:** - Input field labeled "Value" with an attached unit label "kJ/mol" for the calculated enthalpy change.
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