A system absorb 6 KJ of heat and does 1.5 kJof work on its surrounding the change in internal energy is
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ΔQ + ΔW = ΔU
since the heat is absorbed by the system ΔQ is positive.
And work is done on the surroundings ΔW is negative.
6 - 1.5 = ΔU
ΔU = 4.5 kJ
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