A 56.1g sample of iron, which has a specific heat capacity of 0.449Jg1C1, is put into a calorimeter (see sketch at right) that contains 100.0g of water. The temperature of the water starts off at 15.0C. When the temperature of the water stops changing it's 19.7C. The pressure remains constant at 1 atm. Calculate the initial temperature of the iron sample. Be sure your answer is rounded to the correct number of significant digits