NERACA ENTALPI UNTUK PENENTUAN NILAI KALOR PADA BERBAGAI JINTAN HITAM

Abstract

The application of the enthalpy balance in solving the calorific value calculation has substituted the application of equation of DU = m(C)(DT). The energy balance refers to (accumulation) = (total energy entering the system) - (total energy leaving the system) + (heat entering the system) - (work done by the system) + (work to enter mass into the system) - (work to remove mass of the system), which produces an enthalpy balance of DH₁m₁ =DH₂m₂ generating several assumptions. The assumptions include: first, the system is in a steady state condition; second, the system work (W) is quite small; and third, neglect (Dng)RT results in internal energy (DU) of the nickel wire, having a value almost equal to the enthalpy from the oxidation reaction of the nickel wire. The application of the enthalpy balance requires data on the enthalpy of combustion from a standard material, such as benzoic acid. The result of the enthalpy balance is the positive capacity of the bomb calorimeter. In determining the heat of a material, the enthalpy balance equation requires the value of the calorimeter capacity. This experiment examines the calorific value of black cumin in the form of oil, seeds, and a mixture with 20% coconut oil. The test results indicate that black cumin oil has the highest calorific value, which is in accordance with the referred literature reporting that black cumin oil has a high calorific value, while dried black cumin or seeds and palm oil have a similarly low calorific value.