A 2.8-kg piece of aluminum at 43.0 degrees Celsius is placed in 1.0 kg of water in a styrofoam container at room temperature (20 degrees Celsius). What will be the final temperature of the system when thermal equilibrium is reached?
a) 31.5 degrees Celsius
b) 30.0 degrees Celsius
c) 27.0 degrees Celsius
d) 25.5 degrees Celsius