The internal energy of the system is 412 J.
First law of thermodynamics
From the first law of thermodynamics, energy can neither be created nor destroyed. Hence; U = q + w
U = internal energy
q = heat
w = work
Since work was done on the system q is positive. The system looses heat hence q is negative.
U = (-62J) + 474 J = 412 J
The internal energy of the system is 412 J.
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