The heating value of a fuel oil is to he measured in a constant-volume bomb calorimeter. The bomb is charged with oxygen and 0.00215lbm of the fuel and is then sealed and immersed in an insulated container of water. The initial temperature of the system is 77.00°F. The fuel–oxygen mixture is ignited and the fuel is completely consumed. The combustion products are CO2 (g) and H2O (v). The final calorimeter temperature is 87.06°F. The mass of the calorimeter, including the bomb and its contents, is 4.62lbm, and the average heat capacity of the system (Cv) S 0.900 Btu/(lbm∙°F).

(a) Calculate ΔU˚c (Bt/lbm oil) for the combustion of the fuel oil at 77°F. Briefly explain your calculation.

(b) What more would you need to know to determine the higher heating value of the oil?