Water with a mass of 0.500 kg at 15.0 degree C is mixed with 0.800 kg of water at 35.0 degree C. What is the final temperature T_f of the mixture?

Answer 1

the sum of heats gained is zero.

.5*c*(Tf-15)+.8*c*(Tf-35)=0
solve for Tf

Answer 2

in a laboratory a student mixes 300 g water at 80 degree with 400 g water at 20 degree

Answer 3

27.3 c