Thermo 1
One ice cube is dropped into of water in a thermally insulated container. If the water is initially at , and the ice comes from directly from a freezer at . What is the final temperature (in celsius) at thermal equilibrium?
The answer is 2.50.
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1 solution
Lets consider the whole system to be water at 0 degree celsius.
Heat released by water=MC dT= 200/1000×4190×25=20950
Heat absorbed by ice=MC dT+ML=50/1000×2220×15+333000×50÷1000=1665+16650=18315
So we have a total heat of 20950-18315=2635 for a 250 gm water.
So temperature rise= heat/(MC)=2635/((250/1000)×4190)=2.5155 degree celsius.