Respuesta :
The standard change in enthalpy for the combustion = -1333 KJ/mol
C3h4o2 + 3o2 → 3Co2 + 2H20
ΔH = 3(414) + 611 + 347 + 799 + 360 + 464 + 1494 - 4794 - 1856
ΔH = 5317 - 6650 = -1333 Kj/mol
so, standard change in enthalpy for the combustion = -1333 KJ/mol
A thermodynamic system's internal energy and the product of its pressure and volume are added together to form enthalpy, also pronounced "nlpi" (listen). It is a state function that is employed in a variety of measurements in chemical, biological, and physical systems under a constant pressure, which is readily provided by the sizable ambient environment. The pressure-volume word encapsulates the effort necessary to define the system's physical dimensions, i.e., to create space for it by dislodging its surrounds. For solids and liquids under typical conditions, the pressure-volume term is quite small; for gases, it is just modest. Enthalpy, thus, serves as a stand-in for energy in chemical systems; bond, lattice, solvation, and other concepts referred to as "energies" in chemistry are actually differences in enthalpy.
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