2. When gasoline bu rns in a car engine, the heat released causes the products C

Question

2. When gasoline bu rns in a car engine, the heat released causes the products CO2 and H the car's radiator. If the expanding gases do 451 J of work on the pistons and the System releases 325 J to the surroundings as heat, calculate the change in energy What is the sign of work? (1 pts) 20 to expand, which pushes the pistons outward. Excess heat is removed by (AE) in J, kJ, and kcal. (10 pts) E W What is the sign of heat? (1 pts) What is the change in energy (AE) in J? (1pts) What is the change in energy (AE) in kJ? (Ipts) What is the change in energy (AE) in kcal? (Ipts)

Explanation / Answer

Since the work is done on the pistons So the sign of work will be negative "-".

The heat is released by the system , so the sign of heat will also be negative "-".

Change in energy = (-451) + (-325) = -776 J

1 J = 0.001 KJ

So change in energy in KJ = 0.001 x -776 = -0.776 KJ

1 KJ = 0.239 kcal

So -0.776 KJ = -0.776 x 0.239

= -0.185 kcal

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