Posted by james on Sunday, October 5, 2008 at 12:55pm.
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

chemistrythermochemistry  bobpursley, Sunday, October 5, 2008 at 1:02pm
call the 85 g water water1, and the other water2.
sum of heat changes =0
heatfromwater1+heatfromwater1=0
One will be negative, as one of them cools.
mass1*cw*deltaTemp1+mass2*cw+deltaTemp2=0
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...
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