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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.

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
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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**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
Transcribed Image Text:**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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