A 100-g piece of copper is heated in a furnace to a temperature t. The copper is then inserted into a 150-g copper calorimeter containing 200 g of water. The initial temperature of the water and calorimeter is 16oC, and the final temperature after equilibrium is established is 38oC. When the calorimeter and its contents are weighed, 1.2 g of water are found to have evaporated. What was the temperature t?