Under what condition(s)is the enthalpy change of a process equal to the amount of heat transferred into or out of the system? (a)temperature is constant
(b)pressure is constant
(c)volume is constant
A)a only
B)b only
C)c only
D)a and b
E)b and c

Question

Quizplus · Accepted Answer

The enthalpy change of a process is equal to the amount of heat transferred under constant pressure conditions (b), as given by the equation ΔH = q_p. Enthalpy is defined as the heat content of a system at constant pressure, so when pressure is kept constant, any heat transferred into or out of the system is reflected in the change in enthalpy. The other conditions, namely constant temperature (a) and constant volume (c), do not necessarily guarantee that the enthalpy change is equal to the amount of heat transferred.

Under What Condition(s)is the Enthalpy Change of a Process Equal