General Instructions

In this learning activity, you will reflect on all you have learned about thermochemistry and thermodynamics in order to perform calculations involving heat, enthalpy, entropy, or free energy and write a balanced chemical reaction. To successfully achieve this, you will need to review all the study materials for Module One.

Step 1: Review

Review the material based on the topics below.

• Energy Basics
• Enthalpy
• The Second and Third Laws of Thermodynamics
• Free Energy

Step 2: Respond

Read the scenario below, and using supporting data to back your arguments, prepare a 500-600 word written piece that answers all of the questions: 

Case Scenario:

An experiment was conducted to find the thermochemical and thermodynamic properties of a reaction. The reaction is between potassium chloride (KCl) and sulfuric acid (H2SO4). The reaction is as follows:

In the experiment, the following values were obtained:

• Mass of KCl = 2.4 g 
• Temperature at start of reaction = 21°C
• Temperature at the end of reaction = 28°C
• Heat of fusion of KCl = 4.17 kJ/mol
• Heat of reaction = -36.8 kJ
• Entropy change of reaction = -21.2 J/K
• Free energy of reaction = -30.2 kJ

Questions:

1. How much heat was released during the reaction?
2. What is the enthalpy change of the reaction?
3. What is the entropy change of the reaction at 25°C?
4. What is the free energy change of the reaction at 25°C?
5. How much energy is required to melt 1 mol of KCl?

Step 3: Share 

To share your work, click on the “Add a new discussion topic” button under this post and paste your work into the “Message” box. Make sure to reference others’ intellectual property when necessary. All references should follow 7th Edition APA formatting. For further instructions, see the resource on the Himmelfarb Health Sciences Library: APA citation resource (N.B.: references are excluded from word counts).

Step 4: Interact 

To complete the activity, evaluate and categorize the work from one of your peers based on items A - E of the rubric below. Provide a rationale for the grade you have provided, as well as comments or suggestions for improvement. To post a reply, click “Reply” on a particular discussion, write your feedback and then click on “Post to forum.” 

You can use the list below as an example: