Please help. In a well-insulated calorimeter, 1.0 kg of water at 20C is mixed with 1.0g of ice at 0C. What is the net change in entropy of the system by the moment the ice completely melts? The heat of fusion of ice is 3.34*10^5 J/kg. I'm not sure how to do this problem. I thought that since it is 1kg of water, change in entropy for that is -4190/293K. I also though that for the ice, it would be (0.001*3.34*10^5)/273 as well as 4190/273 when it melts. Thank you.