Given: Q = 500 x 4.18 x 8.63 = 18037 J = 18.037 KJ / mol
anthracene = 0.455 g / 178.234 g / mol = 0.00255 mol
Asked: enthalpy?
Answer: enthalpy = Q / anthracene
= 18,037 / 0.00255
= 7073.33 kJ / mol
= -7073 kJ / mol
So, the enthalpy is -7073 kJ / mol.
Thermodynamics is the physics of energy, heat, work, entropy and the spontaneous process. Thermodynamics is closely related to statistical mechanics where the thermodynamic relationship originates. In systems where the process of change of form or energy exchange occurs, classical thermodynamics is not related to the kinetics of the reaction (the speed of a reaction process takes place). Therefore, the use of the term "thermodynamics" usually refers to equilibrium thermodynamics, which is the main concept of a quasi-static process, which is idealized. Meanwhile, time-dependent thermodynamics is non-equilibrium thermodynamics.
Enthalpy is a term in thermodynamics that states the amount of energy from a thermodynamic system. Enthalpy consists of energy in the system, including one of the five potential thermodynamics and state functions, as well as their volume and pressure (an extensive quantity. SI units of enthalpy are joules, but British thermal units and calories are used. Total enthalpy (H) cannot Measure directly, just like in classical mechanics, only the changes can be assessed Enthalpy is a thermodynamic potential, so to measure the enthalpy of a system, we must determine the reference point first, then we can measure the change in enthalpy ΔH, ΔH changes are positive for the reaction endotherms and negatives for exotherms, for processes with constant pressure, ΔH is the same as the energy changes in the system plus the work done by the system to its environment, so the change in enthalpy under these conditions is the heat absorbed or released through chemical reactions or external heat transfer. ideal, solid and liquid does not depend on pressure B. real significance at room temperature and pressure usually follows more or less these properties, to simplify the enthalpy calculation.
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definition of Enthalpy https://brainly.com/question/7451294
Details
Grade: College
Subject: Chemistry
keywords: Enthalpy
