99 ml of H2O is initially at room temperature (20.0oC). A chilled steel rod at 2.0oC is placed in the water. If the final temperature of the system is 18.7oC, what is the mass of the steel bar? Specific heat of water = 4.18 J g-1oC-1; specific heat of steel = 0.452 J g-1oC-1