State Function

Property of a system that is uniquely determined by the current state of the system, not by its history.

State Functions
E, H, S, G, T, P, V
Non-state functions
depend upon path
q, w

Work depends on path

Path ACB:
w = 2 atm (20 L) + 0
= 40 Latm

Path ADB:
w = 0 + 1 atm (20 L)
= 20 Latm