A. How many grams of ice at -17 ^oC must be added to 741 g of water that is initially at a temperature of 70 ^oC to produce water at a final temperature of 12 ^oC? Assume that no heat is lost to the surroundings and that the container has negligible mass. The specific heat of liquid water is 4,190 J/kg.^oC and that of ice is 2,000 J/kg.^oC. For water, the normal melting point is 0 ^oC, and the heat of fusion is 334 x103 J/kg. The normal boiling point is 100 ⁰C, and the heat of vaporization is 2.256 x 106 J/kg.

B. An unknown solid sample with a mass of 85.0 g at a temperature of 100.0 ^oC is placed in a calorimeter. The calorimeter vessel is made of 0.1500 kg of copper and contains 0.200 kg of water. Both the calorimeter vessel and the water are initially at 19.0 ^oC. The final temperature of the system is measured to be 26.1 ^oC.

What is the specific heat of the sample? (Assume no heat loss to the surroundings.)

The specific heat of copper is 390 J/kg-K.

The specific heat of water is 4.19E3 J/kg-K.