posted by james .
A student mixes 85.7 g of water at 68.0°C with 50.7 g of water at 24.5°C in an insulated flask. What is the final temperature of the combined water
call the 85 g water water1, and the other water2.
sum of heat changes =0
One will be negative, as one of them cools.
I assume you can handle it from here. Tf in each will be the same, ti for each is given. A little algebra in this...