The phrase "the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure" is
A)the change in enthalpy of the system.
B)the change in internal energy of the system.
C)the definition of a state function.
D)the temperature change of the system.
E)a statement of Hess's law.

Question

Quizplus · Accepted Answer

The phrase refers to the enthalpy change, which is defined as the heat absorbed or released by the system at constant pressure. This is a fundamental concept in thermodynamics and is denoted by the symbol ΔH.

The Phrase "The Heat Absorbed or Released by a System