A calorimeter consists of a massless beaker that contains 25.0 grams of solid water (i.e., ice) at -30oC. Then 200 grams of iron at 70.0 oC are added to the calorimeter.
a) Find the final temperature of the calorimeter after equilibrium is reached.
b) If the final temperature is 0oC, what fraction of the ice is melted?