Hi Dr Uma,
I came across a free-response question from the Princeton Review. However, I could not get (c) because they used the value 380 J instead of -380 J. Wouldn't that contradict (b), as to calculate the specific heat of Al we used -380 J. Also, it is the cooling of aluminum so shouldn't it indicate an exothermic process? Screenshot 2025-01-25 at 11.02.36 PM.pngScreenshot 2025-01-25 at 11.03.08 PM.png
You can express it as heat lost by Al or heat gained by water.
I think they've given answer in terms of heat gained by water.