125 mL of H2O is initially at room temperature 22.0 degrees C. A chilled steel rod at 2.0 degrees C is placed in the water. If the final temperature of the system is 21.5 degrees C, what is the mass of the steel bar?
Specific heat of water = 4.18 J/g x degrees C
Specific heat of steel = 0.452 J/g x degrees C