(Solved): To determine the type of material collected at a crime scene, the investigators have collected data ...

To determine the type of material collected at a crime scene, the investigators have collected data from its combustion in a calorimeter. A \( 20.5 \mathrm{~g} \) piece of the material was heated to \( 94.4^{\circ} \mathrm{C} \) and placed in \( 50.0 \mathrm{~mL} \) of water at \( 22.8^{\circ} \mathrm{C} \). After thermal equilibrium, the final temperature of the calorimetric system was \( 30.9^{\circ} \mathrm{C} \). What was this unknown material?