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A calorimeter consists of a massless beaker that contains 25.0 grams of solid water (i.e., ice) at -30^oC. 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 0^oC, what fraction of the ice is melted?

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