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As gasoline (octane, C8H18) is burned in a car engine the heat released causes the gases H2O and CO2 to 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

As gasoline (octane, C8H18) is burned in a car engine the heat released causes the gases H2O and CO2 to 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

Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 21E: The temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it...
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As gasoline (octane, C8H18) is burned in a car engine the heat released causes the gases H2O and CO2 to 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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