### How much energy is required for carbon dioxide to sublimate

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1) A vessel contains 32 grams of dry ice (solid carbon dioxide) at T = -78°C, the temperature where it transitions between a solid and a gas at atmospheric pressure. How much energy is required for the carbon dioxide to sublimate? (Ls = 136.38 cal/g)

2) A 35.8 gram piece of iron is placed in a calorimeter filled with 72.1 grams of water at room temperature (23°C). The water heats up and then stabilizes at a temperature of 27°C. Assuming no heat loss to the room or the calorimeter itself, what was the original temperature of the iron sample?

3) A piece of ice weighing 31.9 grams is placed in a calorimeter with 130.7 grams of water at 54.4 degrees Celsius. Assuming no losses and that the calorimeter is perfectly insulated, what is the final temperature?

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