189. assignment (calorimetry)

1.       If mw = 250 g of liquid H2O is at 30°C, how much heat must be removed from it to reach a final temperature of 18°C?

2.       How much thermal energy is required to melt an ice cube, mi = 35g, initially at 0 °C and raise it to a final temperature of 18°C?

3.       Based on these two numbers alone, if the ice cube is dropped into the 250g of liquid H2O, would the final temperature be less than, equal to, or greater than 18°C? Explain your reasoning. (Hint: Consider whether there is less than enough or more than enough energy available, or exactly the right amount to melt and warm the ice to 18°C . What would happen in each situation?)

4.       Consider now that the liquid water was originally contained in an aluminum cup, also initially at 30°C, What is the mass of the aluminum cup if the final temperature of the combined system of cup, original liquid water, and (now melted) ice cube is, in fact, 18°C?

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