Answered: As gasoline (octane, C8H18) is burned…

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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As gasoline (octane, C₈H₁₈) is burned in a car engine the heat released causes the gases H₂O and CO₂to expand pushing the pistons in an outward motion. Any excess heat is removed by the car's radiator. If the expanding gases do 476 J of work on the pistons and the system (engine) releases 327 J of heat to the surroundings. Calculate the change in energy in J, calories, and nutritional Calories.

Useful information: 1 Cal = 1,000 cal = 1 kcal = 4184 J

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Isn't w positive if the work is done on the system and negative if the work is done by the system. The Questions states the expanding gasses preform 476 J of work on the pistons, meaning w would be positive correct?

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