Combining First and Second Laws First Law dU=dQ +dW dW=PdⅤdQ=TdS(可逆&只有体积功) Tds- pdr Fundamental Equation Since H=U+pV: dH= dU+ pdv+vdp dh Tas VdP dG dh- tds- sdT dG= vdp- sdT Because we control p and T, g is a very important quantity in chemistry G carries the combined consequences of the 1st and 2nd laws!Combining First and Second Laws First Law dU = dQ + dW dWrev = -PdV dQrev = TdS (可逆 & 只有体积功) dH = TdS + VdP