#2 please **Exercises**1. If you do 1 J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate.2. If your hot coffee loses 50 kJ of energy in cooling, what is the change in enthalpy of the coffee? Provide both the sign and the magnitude of ΔH.3. Under what condition will the changes in enthalpy and internal energy be identical?4. Identify each of the following as endothermic or exothermic. Explain. - a) steam condensing - b) ice melting - c) two atoms combine to form a molecule: 2Cl(g) → Cl₂(g) - d) an electron is removed from an atom: Na(g) → Na⁺(g) + e⁻Page 94

2. ΔH represents the change in enthalpy of the system. If the heat is released during the chemical…

Answered: 2. If your hot coffee loses 50 kJ of…

2. If your hot coffee loses 50 kJ of energy in cooling, what is the change in enthalpy of the coffee? Provide both the sign and the magnitude of AH.

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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#2 please

**Exercises**

1. If you do 1 J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate.

2. If your hot coffee loses 50 kJ of energy in cooling, what is the change in enthalpy of the coffee? Provide both the sign and the magnitude of ΔH.

3. Under what condition will the changes in enthalpy and internal energy be identical?

4. Identify each of the following as endothermic or exothermic. Explain.
- a) steam condensing
- b) ice melting
- c) two atoms combine to form a molecule: 2Cl(g) → Cl₂(g)
- d) an electron is removed from an atom: Na(g) → Na⁺(g) + e⁻

Page 94

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