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The air in an inflated balloon (the system) absorbs 125 J of heat from its proximity to a fire. The balloon expands and does 85 kJ of work. What is the change in internal energy (in kJ) (ΔU) for the system? Round to the nearest whole number. Do not include units.

Respuesta :

Given:
Q = 125 J, heat absorbed
W = 85 kJ, work done

According to the 1st law of thermodynamics, the change in internal energy is
ΔU = Q - W 
      = 0.125 kJ - 85 kJ
      = - 84.9

Answer:  - 85 (nearest integer)

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