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6.10)A system releases 255 cal of heat to the surroundings and delivers 428 cal of work. What is the change in internal energy of the system (in cal)?

6.10)A system releases 255 cal of heat to the surroundings and delivers 428 cal of work. What is the change in internal energy of the system (in cal)?

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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question 10 please
(d) Mechanical energy to electrical energy (e) Chemical energy to electrical energy 6.6 In winter, an electric heater uses a certain amount of electrical energy to heat a room to 20°C. In summer, an air conditioner uses the same amount of electrical energy to cool the room to 20°C. Is the change in internal energy of the heater larger, smaller, or the same as that of the air conditioner? Explain. 6.7 You lift your textbook and drop it onto a desk. Describe the energy transformations (from one form to another) that occur, moving backward in time from a moment after impact. 6.8 Why is the work done when a system expands against a con- stant external pressure assigned a negative sign? Skill-Building Exercises (grouped in similar pairs) 6.9 A system receives 425 J of heat from and delivers 425 J of work to its surroundings. What is the change in internal energy of the system (in J)? 6.10)A system releases 255 cal of heat to the surroundings and delivers 428 cal of work. What is the change in internal energy of the system (in cal)? 6.11 What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 530 cal of work done on it? 6.12 What is the change in internal energy (in J) of a system that absorbs 0.615 kJ of heat from its surroundings and has 0.247 kcal of work done on it? 6.13 Complete combustion of 2.0 metric tons of coal to gaseous carbon dioxide releases 6.6x10" J of heat. Convert this energy to (a) kilojoules; (b) kilocalories; (c) British thermal units.
Transcribed Image Text:(d) Mechanical energy to electrical energy (e) Chemical energy to electrical energy 6.6 In winter, an electric heater uses a certain amount of electrical energy to heat a room to 20°C. In summer, an air conditioner uses the same amount of electrical energy to cool the room to 20°C. Is the change in internal energy of the heater larger, smaller, or the same as that of the air conditioner? Explain. 6.7 You lift your textbook and drop it onto a desk. Describe the energy transformations (from one form to another) that occur, moving backward in time from a moment after impact. 6.8 Why is the work done when a system expands against a con- stant external pressure assigned a negative sign? Skill-Building Exercises (grouped in similar pairs) 6.9 A system receives 425 J of heat from and delivers 425 J of work to its surroundings. What is the change in internal energy of the system (in J)? 6.10)A system releases 255 cal of heat to the surroundings and delivers 428 cal of work. What is the change in internal energy of the system (in cal)? 6.11 What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 530 cal of work done on it? 6.12 What is the change in internal energy (in J) of a system that absorbs 0.615 kJ of heat from its surroundings and has 0.247 kcal of work done on it? 6.13 Complete combustion of 2.0 metric tons of coal to gaseous carbon dioxide releases 6.6x10" J of heat. Convert this energy to (a) kilojoules; (b) kilocalories; (c) British thermal units.
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