A 15.0 g piece of iron (Cp = 25.09 J/mol-?C) is heated to a temperature of 47.0 ?C and then placed in contact with a 275 g piece of copper at 20.0 ?C (Cp = 25.46 J/mol-?C). What was the final temperature of the two pieces of metal?
A. 33.0 C
B. 30.0 C
C. 25.0 C
D. 20.0 C