A student drops an ice cube into an insulated bottle full of water and waits for the ice cube to completely melt. The ice cube initially has a mass of 105 gand a temperature of 0C. The water (before the ice cube is added) has a mass of 2.00 kg and an initial temperature of 75C. What is the final temperature (in C) of the mixture? (Assume no energy is lost to the walls of the bottle, or to the environment.)