# 842 J of works was done for a gas to be compressed. At the same time, it releases 451 J of heat. What is the change in the energy of the system?

842 J of works was done for a gas to be compressed. At the same time, it releases 451 J of heat. What is the change in the energy of the system?
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Claire Larson
Given ->
Work = +842 J ( work done on the system)
Q = -451 J ( heat released)
According to first law of thermodynamics->

Change in energy = 391 J