A second student places a hot sample of iron into cold water. Her data is shown below. What
was the mass of the sample of metal she placed into the cold water? Enter your answer to the
nearest whole number of grams.

Mass of cold water: 100 g
Initial temperature of water: 20.0°C
Specific heat of iron:
0.449 J/gºC
Initial temperature of iron: 80.0°C
Equilibrium temperature of system:
42.5°C