Question

What is the final temperature when you mix 40ml of 40degree celcius water and 25ml of 20 degree celcius water?

Answer 1

C*40*(40-T) = C*25*(T-20)

C, the specific heat of water, cancels out.

8(40-T) = 5(T-20)

320 +100 = 13 T

Solve for T (the final equilibrium value)