stem of mass 1.0 x 10^-2. kg at a temperature of 100 degrees C was passed into a mixture of water and ice of total mass 4.0 x 10^-1 kg at 0 degrees C and contained in a calorimeter of mass 1.2x10^-1 kg. If the quantity of ice contained in the mixture was 5.0x10^-2 kg. calculate the final temperature of the mixture