# Change of enthalpy

1. Aug 17, 2005

### suli

as Q(heat transfer)=P*dV + dE
Q is a non state function,
while the change of enthalpy,
dH=P*dv+dE,
i suppose it is equal to the Q above but why dH is a state function while Q is not since they are the same?

2. Aug 17, 2005

### HallsofIvy

Staff Emeritus
The enthalpy, H, is a state function. Is that necessarily true of change of enthalpy?

3. Aug 17, 2005

### suli

so u mean dH is not a state function?