Answer to Question #304121 in Physics for shan

Question #304121

When gasoline burns in an automobile engine, the heat released causes the product CO2 and H2O to expand,which pushes the piston outward. if the expanding gases do 789 J of water on the piston and the system loses 245 J of heat, calculate ΔU\Delta U in J


1
Expert's answer
2022-03-07T18:06:40-0500

According to the first law of thermodynamics, the change in internal energy is given as follows:


ΔU=δQδW\Delta U = \delta Q-\delta W

where δQ\delta Q is the heat gained by the system (negative, if system looses heat) and δW\delta W is the work done by the gases. Thus, obtain:


ΔU=245J789J=1034J\Delta U = -245J-789J = -1034J

Answer. -1034J.


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