Question

Explain transfer of internal energy between system and environment when both are

not in thermal equilibrium and hence define heat.

Calculate average K.E. per molecule of oxygen gas at 127 oC.
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Answer 1

Answer:

Enthalpy, the sum of the internal energy and the product of the pressure and volume of a thermodynamic system. Enthalpy is an energy-like property or state function—it has the dimensions of energy (and is thus measured in units of joules or ergs), and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history. In symbols, the enthalpy, H, equals the sum of the internal energy, E, and the product of the pressure, P, and volume, V, of the system: H = E + PV.