You are given the following hypothetical reactions: 2A → B+C ΔΗ = +50 kJ A → D AH = -80 kJ Part A Use Hess's law to calculate AH for the reaction B + C → 2D. Express your answer in kilojoules to three significant figures. 15. ΑΣΦ AH = Submit Part B AH = Request Answer Submit What is AH for the reaction D → 1 2 Express your answer in kilojoules to three significant figures. VGI ΑΣΦ Request Answer B + 1²1/20 ? C? kJ ? kJ

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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**Chapter 5: Problem 5.62**

You are given the following hypothetical reactions:

- \(2A \rightarrow B + C \quad \Delta H = +50 \, \text{kJ}\)
- \(A \rightarrow D \quad \Delta H = -80 \, \text{kJ}\)

---

### Part A

**Use Hess’s law to calculate \(\Delta H\) for the reaction:**

\[B + C \rightarrow 2D\]

**Express your answer in kilojoules to three significant figures.**

\(\Delta H = \) [Input box] kJ

[Submit] [Request Answer]

---

### Part B

**What is \(\Delta H\) for the reaction:**

\[D \rightarrow \frac{1}{2}B + \frac{1}{2}C\]

**Express your answer in kilojoules to three significant figures.**

\(\Delta H = \) [Input box] kJ

[Submit] [Request Answer]

[Provide Feedback]

---

**Note:** The problem involves using Hess's law to find the enthalpy changes for reactions not directly given, thus allowing students to practice manipulating chemical equations and associated enthalpy values.
Transcribed Image Text:**Chapter 5: Problem 5.62** You are given the following hypothetical reactions: - \(2A \rightarrow B + C \quad \Delta H = +50 \, \text{kJ}\) - \(A \rightarrow D \quad \Delta H = -80 \, \text{kJ}\) --- ### Part A **Use Hess’s law to calculate \(\Delta H\) for the reaction:** \[B + C \rightarrow 2D\] **Express your answer in kilojoules to three significant figures.** \(\Delta H = \) [Input box] kJ [Submit] [Request Answer] --- ### Part B **What is \(\Delta H\) for the reaction:** \[D \rightarrow \frac{1}{2}B + \frac{1}{2}C\] **Express your answer in kilojoules to three significant figures.** \(\Delta H = \) [Input box] kJ [Submit] [Request Answer] [Provide Feedback] --- **Note:** The problem involves using Hess's law to find the enthalpy changes for reactions not directly given, thus allowing students to practice manipulating chemical equations and associated enthalpy values.
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