Answer
-198 J
Work Step by Step
∆U = q+w, where q is the heat and w is the work done.
Here, work is done on the surroundings. Hence, w is negative and is equal to -325 J. Heat is absorbed. So, it is positive and is equal to 127 J.
Then, ∆U = -325 J + 127 J = -198 J.
