For a system which undergoes an infinitesimal reversible process between two equilibrium states, the change in internal energy is

For a system which undergoes an infinitesimal reversible process betw

1.	For a system which undergoes an infinitesimal reversible process between two equilibrium states, the change in internal energy is
A.	dU = pdV – TdS
B.	dU = TdS + pdV
C.	dU = TdS – pdV
D.	dU = -TdS – pdV
Answer» D. dU = -TdS – pdV