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5.00 kg of some liquid at 10.0 oC is mixed with 1.00 kg of the same liquid at 40.0 oC. what is the final equilibrium temperature? ignore any heat flow with the containers and/or surroundings

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the sum the heats gained is zero.
heat1+heat2=0
5*c*(Tf-10)+1*c*(tf-40)=0

c divides out, solve for Tf

tf(5+1)=50+40
tf= 90/6=15C

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