A Student Is Preparing to Perform a Series of Calorimetry

A student is preparing to perform a series of calorimetry experiments.She first wishes to determine the calorimeter constant (C_cal) for her coffee cup calorimeter.She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K.She carefully records the final temperature of the water as 317 K.What is the value of C_cal for the calorimeter?

A) 19 J K^-1
B) 28 J K^-1
C) 99 J K^-1
D) 21 J K^-1
E) 76 J K^-1