Hey. I am doing a lab experiment in school to find the molar enthalpy of fusion of water. Ice and water are mixed in a calorimeter and the temperatures are recorded. Here are my results. Mass of ice cube: 6.61g. Mass of water: 100g. Initial ice temperature: 0 degrees celsius. Initial water temperature: 21 degrees celsius. Final Temperature of ice and water: 16 degrees celsius. To calculate the molar enthaply I used mcT(ice)+nH = mcT(water) now I substitute in my values. 6.61(4.19)(16)+(6.61/18.02)H=100(4.19)(5) My question is about the change in temperature value for water(T). Should it be 5, or -5? Would it be 5 since heat is being lost? I've calculated using both values and it seems like using -5 will get an answer that is closer to the accepted value of molar enthalpy of fusion of water. Can someone please tell me the correct way to do this? Thanks.