1. A 0.40 kg iron horseshoe that is initially at 500 degrees Celsius is dropped into a bucket containing 20 kg of water at 22 degrees Celsius. What is the final equilibrium temperature? Neglect any energy transfer to or from the surrounding.

2. An aluminum cup contains 225 g of water and a 40 g coffee stirrer, all at 27 degrees Celsius. A 400 g sample of silver at an initial temperature of 87 degrees Celsius is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature at 32 degrees Celsius. Calculate the mass of the aluminum cup.

3. A 50 g ice cube at 0 degrees Celsius is heated until 45 g has become water at 100 degrees Celsius and 5 g has become steam at 100 degrees Celsius. How much energy was added to accomplish this?

4. What mass of steam that is initially at 120 degrees Celsius is needed to warm 350 g of water and its 300 g aluminum container from 20 degrees Celsius to 50 degrees Celsius?

5. Steam at 100 degrees Celsius is added to ice at 0 degree Celsius.
a. Find the amount of ice melted and the final temperature when the mass of the steam is 10 g and the mass of ice is 50 g.
b. Repeat with steam of mass 1.0 g and ice of mass 50 g.

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