Question

two 10.0L buckets of hot water at 65 degrees celsius are mixed with one 10.0L bucket of cold water at 18 degrees celsius. calcualte the final equilibrium temperature after mixing, assuming no thermal energy loss to the environment.

Answer 1

The temperature difference is initially 65-18 = 47 degrees. To reach equilibrium, the 20 l of hot water only has to drop in temerature half as much (15.7 C) as the 10 l of cold water has to rise (31.3 C). The final equilibrium temp is 49.3 C.