1. The problem statement, all variables and given/known data The issue is the word 'increase' in c)iii), where I'm pretty sure the wording should have been 'decrease' or at least 'change', since both the work done and the heat removed have a negative value. 2. Relevant equations dU = dQ + dW (1st law) 3. The attempt at a solution My answer to c)iii) was -160J.