A 98-g piece of copper is heated in a furnace to a temperature tC. The copper is then inserted into a 150-g copper calorimeter containing 207 g of water. The initial temperature of the water and calorimeter is 16°C, and the final temperature after equilibrium is established is 38° C. When the calorimeter and its contents are weighed, 1.2 g of water are found to have evaporated. What was the temperature tC?

Apply conservation of energy to this calorimetry problem. The water is heated, and some evaporated, while the copper piece cools.