1. The problem statement, all variables and given/known data 10g of water at 0˚C added to 100g water at 50˚C 2. Relevant equations Qhot+Qcold=0 Q=mcΔT Q=mL Σmc(Tf-Ti)=0 3. The attempt at a solution So I understand this problem, but I'm not sure when I am supposed to use Q=mL, L being the latency, I think. So with the problem mentioned you can do: mw*cw(Tf-0) + mw*cw(Tf-50) = 0 and solve for Tf. Tf= 45.45˚K What if I had a problem like 10g ice at 0˚C added to 100g water at 50˚C? Do you write the equation step by step starting at ice? And do I use Q=mL to account for phase changes only? [solid to liquid] and [liquid to gas]? mice*cice(Tf-0) + mL +mw*cw(Tf-50) = 0 Solve for TF. I think this is set up correctly, but I am not sure. Can you explain the mL part more? Is that the mass of ice * the latency of ice? This is where I get confused on how to do these problems.