What Defines Enthalpy Change,∆H

Question

What defines enthalpy change,∆H?
A)It is the sum of heat absorbed and work.
B)It is a measure of disorder in a system.
C)It is equal to the heat transferred at constant pressure and volume.
D)It is determined by pressure change at a constant temperature.

Accepted Answer

Enthalpy change, ∆H, is defined as the heat transferred at constant pressure and volume. It is a measure of the change in energy of a system during a process, and is typically expressed in units of Joules or calories. The other choices, A, B, and D, are incorrect because they do not accurately define enthalpy change. Enthalpy change does not include work, is not a measure of disorder, and is not determined by pressure change at a constant temperature.