This an extra voluntary question on a physics assignment I've already handed in. But I still want to try and figure it out so here goes: 1. The problem statement, all variables and given/known data This is what I'm told: "You take 100 g ice cubes from the freezer. The ice cubes' temperature is -18°C." The specific heat capacity of ice is 2,0 kJ/kg*K. And then asked: "How big an amount of water at 20°C is required to melt the ice cubes from the freezer?" 2. Relevant equations Qwater = cmΔT Qice = mL cwater*mwater*∆Twater+mice*Lmelt+cwater*mice*∆Tice=0 3. The attempt at a solution I assume I need to find L, because in the examples in the book the L's used are for materials at either 0°C or 100°C, which I've isolated: -Lmelt=(cwater*mwater*∆Twater)/(-mis )+(cwater*mice*∆Tice)/(-mice ) The problem is that I also don't know mwater because that's what the problem asks me to find. Will any amount of 20°C hot water melt the ice cubes eventually or something?