A 5 g piece of ice at -20C is put into 10 g of water at 30C. Assuming that heat is exchanged only between the ice and the water, find the final temperature of the mixture. Specific heat capacity of ice = 2100 J kg -C -, specific heat capacity of water = 4200 J kg- C - and latent heat of fusion of ice = 3.36 x 10 J kg -1 .