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Answer: Δ 100 J
Step-by-step explanation:
Since, Q = 70 J (heat added to the system) and W = -30 J (work done by the system on the surroundings), we;
Substitute these values into the equation, we have:
ΔU = 70 J - (-30 J)
ΔU = 70 J + 30 J
ΔU = 100 J
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