A simple "adiabatic bomb" calorimeter was used to measure the heat capacity of an unknown substance. Fifty-nine grams of the substance, was heated to 808 K and then placed in 3 liters of oil at 25°C. After equilibration, the temperature was 65 °C. The heat capacity of the oil is 2.6 J/g-K, and its density is 0.79 g/cm^3. What is the heat capacity of the unknown [J/gK]?