p The fundamental equations The First Law: dU=dg+dw H For a reversible change in a composition, and in the pl closed system of constant absence of any non-expansion P A TS work d w=-pdy and dq =tds G TS du=Tds -pdv dv is an exact differential, its value is independent of pa 版权所有:华东理工大学物理化学教研版权所有：华东理工大学物理化学教研室 6 The First Law: dU =dq+dw H pV U pV A TS G TS For a reversible change in a closed system of constant composition, and in the absence of any non-expansion work: d w = -pdV and dq =TdS dU=TdS-pdV dU is an exact differential, its value is independent of path. The fundamental equations